CMsgBox: add missing disableTimeOutBar()

addendum to
CHintBox: move showTimeOutBar() to protected, add params to enableTimeOutBar()


Origin commit data
------------------
Commit: 3a6f9e5ffa
Author: Thilo Graf <dbt@novatux.de>
Date: 2016-10-26 (Wed, 26 Oct 2016)

src/gui/widget/msgbox.cpp

@@ -304,6 +304,7 @@ int CMsgBox::exec()
 		}
 	}
 
+	disableTimeOutBar();
 	return res;
 }