qt_update_submodules: Fix some submodules

qtconnectivity, qtlocation and qtsystems don't have a master branch
anymore, they have switched to use dev/stable/release scheme instead.

Change-Id: I7d5101dd6c6dd346ac75ff7f616b5dcb5b9fc71d
Reviewed-by: David Faure (KDE) <faure@kde.org>