leave files in destination folder during extraction

.ci/azure-pipelines-main.yml

@@ -47,6 +47,7 @@ jobs:
         inputs:
           archiveFilePatterns: '$(Agent.TempDirectory)/*.zip'
           destinationFolder: '$(Build.SourcesDirectory)/MediaBrowser.WebDashboard'
+          cleanDestinationFolder: false
 
       - task: UseDotNet@2
         displayName: "Update DotNet"