Fix jagged indentation in wxGenericCalendarCtrl mouse code

No real changes.

src/generic/calctrlg.cpp

@@ -1330,16 +1330,16 @@ void wxGenericCalendarCtrl::OnDClick(wxMouseEvent& event)
         case wxCAL_HITTEST_DAY:
             GenerateEvent(wxEVT_CALENDAR_DOUBLECLICKED);
             break;
+
         case wxCAL_HITTEST_DECMONTH:
         case wxCAL_HITTEST_INCMONTH:
-            
             // allow quickly clicking the inc/dec button any number of
             // times in a row by handling also the double-click event.
             OnClick(event);
             break;
+
         default:
             event.Skip();
-        break;
     }
 }