[Git] No need to call FileService.ThawEvents on UI thread

The FileService.ThawEvents method will now handle being called
from a background thread.

main/src/addins/VersionControl/MonoDevelop.VersionControl.Git/MonoDevelop.VersionControl.Git/Commands.cs

@@ -173,9 +173,7 @@ protected override void Run ()
 						}
 						finally {
 							monitor.Dispose ();
-							Runtime.RunInMainThread (delegate {
-								FileService.ThawEvents ();
-							});
+							FileService.ThawEvents ();
 						}
 					});
 				}