Fix certficate thumbprint for UWP sample project

For more information about why this necessary take a look here
http://www.rudyhuyn.com/blog/2019/08/05/how-to-fix-certificate-does-not-match-supplied-signing-thumbprint/

Author: mjuen

samples/features/Features.UWP/Features.UWP.csproj

@@ -18,7 +18,7 @@
     <ProjectTypeGuids>{A5A43C5B-DE2A-4C0C-9213-0A381AF9435A};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <PackageCertificateKeyFile>Features.UWP_TemporaryKey.pfx</PackageCertificateKeyFile>
     <RuntimeIdentifiers>win10-arm;win10-arm-aot;win10-x86;win10-x86-aot;win10-x64;win10-x64-aot</RuntimeIdentifiers>
-    <PackageCertificateThumbprint>B7A25D83EAD631188A9505D2D7C411770734C52B</PackageCertificateThumbprint>
+    <PackageCertificateThumbprint>714bf81d767ae7aa7fcf3bb435b0804ad3eadb05</PackageCertificateThumbprint>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
     <DebugSymbols>true</DebugSymbols>
@@ -268,4 +268,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>