WinGui: Fix an issue with the Output Settings preset name display. It…

… was intermittently showing "Custom" for a selected preset.

git-svn-id: svn://localhost/HandBrake/trunk@4378 b64f7644-9d1e-0410-96f1-a4d463321fa5

win/CS/Controls/x264Panel.cs

@@ -150,7 +150,7 @@ public void StandardizeOptString()
             }
 
             /* Change the option string to reflect the new standardized option string */
-            if (changedOptString != string.Empty)
+            if (!string.IsNullOrEmpty(changedOptString) && !rtf_x264Query.Text.Equals(changedOptString))
                 rtf_x264Query.Text = changedOptString;
         }