comctl32: Send DTN_DATETIMECHANGE when the checkbox changes too.

dlls/comctl32/datetime.c

@@ -1060,6 +1060,7 @@ DATETIME_Button_Command (DATETIME_INFO *infoPtr, WPARAM wParam, LPARAM lParam)
         DWORD state = SendMessageW((HWND)lParam, BM_GETCHECK, 0, 0);
         infoPtr->dateValid = (state == BST_CHECKED);
         InvalidateRect(infoPtr->hwndSelf, NULL, TRUE);
+        DATETIME_SendDateTimeChangeNotify(infoPtr);
     }
     return 0;
 }