Add a mark as watched/unwatched option to longpress dialogue

Both the Movies and Shows don't have an option to manually set them as watched/unwatched. I would really be able to do so for my own overview

Start by locating the long-press dialogue used for Movies and Shows in the Android app and inspect how their watched state is currently represented. The work is done when both dialogues offer manual watched and unwatched actions and those choices update the item's state.

Written by the indexing model from the issue text.