Revert back to before commit 3fae06d [Fix PostBuild event for copying Bootstrap DLL (#3683)] (#3711)

Author: codendone

build/NuSpecs/WindowsAppSDK-Nuget-Native.C.props

@@ -29,7 +29,7 @@
       </AdditionalDependencies>
     </Link>
     <PostBuildEvent>
-      <Command>xcopy.exe /-I /y "$(MSBuildThisFileDirectory)..\..\runtimes\win10-$(_WindowsAppSDKFoundationPlatform)\native\Microsoft.WindowsAppRuntime.Bootstrap.dll" "$(OutDir)Microsoft.WindowsAppRuntime.Bootstrap.dll"</Command>
+      <Command>xcopy.exe /y "$(MSBuildThisFileDirectory)..\..\runtimes\win10-$(_WindowsAppSDKFoundationPlatform)\native\Microsoft.WindowsAppRuntime.Bootstrap.dll" "$(OutDir)"</Command>
     </PostBuildEvent>
   </ItemDefinitionGroup>