0.13 needs a transitive database model

It has gone unnoticed that the 3.5.x version of VLC Android uses the 0.13.0-rc.2 tag. Without any db model bump since this tag, the DB migration will be skipped between VLC Android 3.5.6 (which uses 0.13.0-rc.2) and VLC Android 4.0 (which will use the stable 0.13.0).

This is problematic since the model changed since 0.13.0-rc.2. The model needs to be bumped and the changes since the last tag needs to be reverted and ported to the new model version.