Reset the authentication cache when trying new credentials

Otherwise Qt attempts to be smart and re-uses previously successful
username (email) and password. This is an odd corner case, but it seems
the right thing to do.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-mobile/qmlmanager.cpp

@@ -166,6 +166,7 @@ void QMLManager::saveCloudCredentials()
 		syncLoadFromCloud();
 		QString url;
 		getCloudURL(url);
+		manager()->clearAccessCache(); // remove any chached credentials
 		openLocalThenRemote(url);
 	}
 }