Set DefaultAppHostRuntimeIdentifier when building the product (i.e. i… (#59286)

* Set DefaultAppHostRuntimeIdentifier when building the product (i.e. inside the VMR).

* Update Directory.Build.props

Author: ViktorHofer

eng/Common.props

@@ -7,7 +7,7 @@
     <TargetArchitecture Condition="'$(TargetArchitecture)' == ''">x64</TargetArchitecture>
     <TargetRuntimeIdentifier Condition="'$(TargetRuntimeIdentifier)' == ''">$(TargetOsName)-$(TargetArchitecture)</TargetRuntimeIdentifier>
     <PortableBuild Condition="'$(PortableBuild)' == ''">true</PortableBuild>
-    <DefaultAppHostRuntimeIdentifier Condition=" '$(DotNetBuildSourceOnly)' == 'true' ">$(TargetRuntimeIdentifier)</DefaultAppHostRuntimeIdentifier>
+    <DefaultAppHostRuntimeIdentifier Condition=" '$(DotNetBuild)' == 'true' ">$(TargetRuntimeIdentifier)</DefaultAppHostRuntimeIdentifier>
 
     <BuildNodeJS>$(BuildNodeJSUnlessSourcebuild)</BuildNodeJS>
     <BuildNodeJS Condition="'$(DotNetBuildSourceOnly)' == 'true'">false</BuildNodeJS>