AreaComAdminWindow: Fix GstNrInput validation by removing CheckGstNr

Elwig/Windows/AreaComAdminWindow.xaml.cs

@@ -441,13 +441,5 @@ namespace Elwig.Windows {
         private void FbNrInput_LostFocus(object sender, RoutedEventArgs evt) {
             InputLostFocus((TextBox)sender, Validator.CheckFbNr);
         }
-        
-        private void GstNrInput_TextChanged(object sender, RoutedEventArgs evt) {
-            InputTextChanged((TextBox)sender, Validator.CheckGstNr);
-        }
-
-        private void GstNrInput_LostFocus(object sender, RoutedEventArgs evt) {
-            InputLostFocus((TextBox)sender, Validator.CheckGstNr);
-        }
     }
 }