modules: upnp: player: fix some state misusage
modules: upnp: player: fix some state misusage

The state retrieved from the Rygel renderer was badly handled,
especially on 'EOS'. It fixes the stop of pipeline at exit or renderer
exit, additionally to the move to the next media in playlist.
Finally, the renderer is restarted when the name is changed from the
settings.

dillya/melo