Update CloudMirrorPackage TargetPlatformVersion (#267)

Per the following issue update the TargetPlatformVersion to 10.0.22621.0 (from the pre-release version of 10.022598.0):
#267

Author: smithmatadsk

Samples/CloudMirror/CloudMirrorPackage/CloudMirrorPackage.wapproj

@@ -35,7 +35,7 @@
   <Import Project="$(WapProjPath)\Microsoft.DesktopBridge.props" />
   <PropertyGroup>
     <ProjectGuid>1fab5d02-237c-4b9c-b820-2eb7c3b6e63a</ProjectGuid>
-    <TargetPlatformVersion>10.0.22598.0</TargetPlatformVersion>
+    <TargetPlatformVersion>10.0.22621.0</TargetPlatformVersion>
     <TargetPlatformMinVersion>10.0.18362.0</TargetPlatformMinVersion>
     <DefaultLanguage>en-US</DefaultLanguage>
     <PackageCertificateKeyFile>CloudMirrorPackage_TemporaryKey.pfx</PackageCertificateKeyFile>