[UVHD Tenant Admin] Add admin cmdlet to delete and copy UVHD part 4

Author: arcadiahlyy

src/ServiceManagement/RemoteApp/Commands.RemoteApp/UserDisk/CopyAzureRemoteAppUserDisk.cs

@@ -49,8 +49,7 @@ public class CopyAzureRemoteAppUserDisk : RdsCmdlet
         public override void ExecuteCmdlet()
         {
             AzureOperationResponse response = null;
-            bool overwriteExistingUserDisk = OverwriteExistingUserDisk ? true : false;
-            response = CallClient(() => Client.UserDisks.Copy(SourceCollectionName, DestinationCollectionName, UserUpn, overwriteExistingUserDisk), Client.UserDisks);
+            response = CallClient(() => Client.UserDisks.Copy(SourceCollectionName, DestinationCollectionName, UserUpn, OverwriteExistingUserDisk.IsPresent), Client.UserDisks);
         }
     }
 }