changing default platform to x64 from x86 (#4414)

Author: ShashankNay

dev/VSIX/ProjectTemplates/Desktop/CSharp/PackagedApp/BlankApp/WinUI.Desktop.Cs.BlankApp.vstemplate

@@ -24,7 +24,7 @@
     <ProjectTypeTag>desktop</ProjectTypeTag>
     <ProjectTypeTag>WinUI</ProjectTypeTag>
   </TemplateData>
-  <TemplateContent PreferedSolutionConfiguration="Debug|x86">
+  <TemplateContent PreferedSolutionConfiguration="Debug|x64">
     <Project File="ProjectTemplate.csproj" ReplaceParameters="true">
       <ProjectItem ReplaceParameters="true" TargetFileName="win-arm64.pubxml">Properties\PublishProfiles\win-arm64.pubxml</ProjectItem>
       <ProjectItem ReplaceParameters="true" TargetFileName="win-x64.pubxml">Properties\PublishProfiles\win-x64.pubxml</ProjectItem>

dev/VSIX/ProjectTemplates/Desktop/CSharp/PackagedApp/WinUI.Desktop.Cs.PackagedApp.vstemplate

@@ -23,7 +23,7 @@
     <ProjectTypeTag>desktop</ProjectTypeTag>
     <ProjectTypeTag>WinUI</ProjectTypeTag>
   </TemplateData>
-  <TemplateContent PreferedSolutionConfiguration="Debug|x86">
+  <TemplateContent PreferedSolutionConfiguration="Debug|x64">
     <CustomParameters>
       <CustomParameter Name="$DotNetVersion$" Value="FIXME-Verify-Directory.Build.Targets-XmlPoke-Queries"/>
     </CustomParameters>

dev/VSIX/ProjectTemplates/Desktop/CSharp/SingleProjectPackagedApp/WinUI.Desktop.Cs.SingleProjectPackagedApp.vstemplate

@@ -23,7 +23,7 @@
     <ProjectTypeTag>desktop</ProjectTypeTag>
     <ProjectTypeTag>WinUI</ProjectTypeTag>
   </TemplateData>
-  <TemplateContent PreferedSolutionConfiguration="Debug|x86">
+  <TemplateContent PreferedSolutionConfiguration="Debug|x64">
     <CustomParameters>
       <CustomParameter Name="$WindowsAppSDKNupkgVersion$" Value="FIXME-Verify-Directory.Build.Targets-XmlPoke-Queries" />
       <CustomParameter Name="$WindowsSDKBuildToolsNupkgVersion$" Value="FIXME-Verify-Directory.Build.Targets-XmlPoke-Queries" />

dev/VSIX/ProjectTemplates/Desktop/CSharp/UnitTestApp/WinUI.Desktop.Cs.UnitTestApp.vstemplate

@@ -24,7 +24,7 @@
     <ProjectTypeTag>WinUI</ProjectTypeTag>
     <ProjectTypeTag>test</ProjectTypeTag>
   </TemplateData>
-  <TemplateContent PreferedSolutionConfiguration="Debug|x86">
+  <TemplateContent PreferedSolutionConfiguration="Debug|x64">
     <CustomParameters>
       <CustomParameter Name="$DotNetVersion$" Value="FIXME-Verify-Directory.Build.Targets-XmlPoke-Queries"/>
     </CustomParameters>

dev/VSIX/ProjectTemplates/Desktop/CppWinRT/PackagedApp/WinUI.Desktop.CppWinRT.PackagedApp.vstemplate

@@ -22,7 +22,7 @@
     <ProjectTypeTag>desktop</ProjectTypeTag>
     <ProjectTypeTag>WinUI</ProjectTypeTag>
   </TemplateData>
-  <TemplateContent PreferedSolutionConfiguration="Debug|x86">
+  <TemplateContent PreferedSolutionConfiguration="Debug|x64">
     <ProjectCollection>
       <ProjectTemplateLink ProjectName="$projectname$ (Package)" CopyParameters="true">WapProj\WinUI.Desktop.CppWinRT.WapProj.vstemplate</ProjectTemplateLink>
       <ProjectTemplateLink ProjectName="$projectname$" CopyParameters="true">BlankApp\WinUI.Desktop.CppWinRT.BlankApp.vstemplate</ProjectTemplateLink>

dev/VSIX/ProjectTemplates/Desktop/CppWinRT/SingleProjectPackagedApp/WinUI.Desktop.CppWinRT.SingleProjectPackagedApp.vstemplate

@@ -22,7 +22,7 @@
     <ProjectTypeTag>desktop</ProjectTypeTag>
     <ProjectTypeTag>WinUI</ProjectTypeTag>
   </TemplateData>
-  <TemplateContent PreferedSolutionConfiguration="Debug|Win32">
+  <TemplateContent PreferedSolutionConfiguration="Debug|x64">
     <Project File="ProjectTemplate.vcxproj" ReplaceParameters="true">
       <ProjectItem ReplaceParameters="true" TargetFileName="$projectname$.vcxproj.filters">ProjectTemplate.vcxproj.filters</ProjectItem>
       <ProjectItem ReplaceParameters="false" TargetFileName="pch.cpp">pch.cpp</ProjectItem>

dev/VSIX/ProjectTemplates/Desktop/CppWinRT/UnitTestApp/WinUI.Desktop.CppWinRT.UnitTestApp.vstemplate

@@ -23,7 +23,7 @@
     <ProjectTypeTag>WinUI</ProjectTypeTag>
     <ProjectTypeTag>Test</ProjectTypeTag>
   </TemplateData>
-  <TemplateContent PreferedSolutionConfiguration="Debug|Win32">
+  <TemplateContent PreferedSolutionConfiguration="Debug|x64">
     <Project File="ProjectTemplate.vcxproj" ReplaceParameters="true">
       <ProjectItem ReplaceParameters="true" TargetFileName="$projectname$.vcxproj.filters">ProjectTemplate.vcxproj.filters</ProjectItem>
       <ProjectItem ReplaceParameters="false" TargetFileName="pch.cpp">pch.cpp</ProjectItem>