fixes "leavegame-button accidentally disabled" and "preactions shows

during autofold"

src/gui/qt/gamelobbydialog/gamelobbydialogimpl.cpp

@@ -1384,6 +1384,8 @@ void gameLobbyDialogImpl::closeEvent(QCloseEvent *event)
 	waitStartGameMsgBoxTimer->stop();
 	waitStartGameMsgBox->hide();
 	waitRejoinStartGameMsgBox->hide();
+	//enable leave button again - it was disabled during waitxyzMsgBoxes
+	pushButton_Leave->setEnabled(true);
 }