[UWP] Update test cert for UWPUnitTests package (#3346)

Author: paulcam206

source/uwp/UWPUnitTests/UWPUnitTests.csproj

@@ -18,6 +18,7 @@
     <ProjectTypeGuids>{A5A43C5B-DE2A-4C0C-9213-0A381AF9435A};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <PackageCertificateKeyFile>UWPUnitTests_TemporaryKey.pfx</PackageCertificateKeyFile>
     <UnitTestPlatformVersion Condition="'$(UnitTestPlatformVersion)' == ''">$(VisualStudioVersion)</UnitTestPlatformVersion>
+    <PackageCertificateThumbprint>D0CAAB2669414215AAA8CD0B8FB5A14D978A1ED5</PackageCertificateThumbprint>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
     <DebugSymbols>true</DebugSymbols>