msgbox: add missing handling of RC_home as cancel key

Origin commit data
------------------
Commit: 8f2d5302f4
Author: vanhofen <vanhofen@gmx.de>
Date: 2018-03-26 (Mon, 26 Mar 2018)

Origin message was:
------------------
- msgbox: add missing handling of RC_home as cancel key

src/gui/widget/msgbox.cpp

@@ -318,6 +318,10 @@ int CMsgBox::exec()
 			result = (msg_result_t)ccw_footer->getSelectedButtonObject()->getButtonResult();
 			loop = false;
 		}
+		//***cancel button***
+		else if (msg == CRCInput::RC_home) {
+			loop = false;
+		}
 		//***ignore***
 		else if (CNeutrinoApp::getInstance()->listModeKey(msg)){
 			// do nothing //TODO: if passed rc messages are ignored rc messaages: has no effect here too!!