Invalidate the remembered git SHA when changing credentials

Otherwise, when switching back and forth between two logins, during the
second switch the dive list is not loaded as the code checks against the
remembered git SHA before rewriting the dive list.

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

qt-mobile/qmlmanager.cpp

@@ -167,6 +167,7 @@ void QMLManager::saveCloudCredentials()
 		QString url;
 		getCloudURL(url);
 		manager()->clearAccessCache(); // remove any chached credentials
+		clear_git_id(); // invalidate our remembered GIT SHA
 		openLocalThenRemote(url);
 	}
 }