Merge pull request #1877 from tyrielv/async-prefetch-feedback

Minor changes to asynchronous prefetch workflow:
* Use the current executable's location instead of relying on environment to find it.
* Launch the process minimized instead of hidden.

Author: tyrielv

GVFS/GVFS/CommandLine/CloneVerb.cs

@@ -254,7 +254,7 @@ public override void Execute()
                                     arguments: "prefetch --commits")
                                     {
                                         UseShellExecute = true,
-                                        WindowStyle = ProcessWindowStyle.Hidden,
+                                        WindowStyle = ProcessWindowStyle.Minimized,
                                         WorkingDirectory = enlistment.EnlistmentRoot
                                     });
                                 this.Output.WriteLine("\r\nPrefetch of commit graph has been started as a background process. Git operations involving history may be slower until prefetch has completed.\r\n");