Remove duplicate option

There is no need to reinitialize the structure.

The D-Bus interface is always started automatically. It should NOT be
added to --control.

...instead of libvlc.c. Note that this only concerns the playlist SD.
The LibVLC SD were always dealt with separately.

Those interfaces that need playlist deactivation can now call it
explicitly.

Media library is crap, but that is not an excuse.

That way, playlist_CurrentInput() can be called from the callbacks.

playlist_CurrentInput() could return the input that the playlist was
destroying. In principles, that was harmless, but silly.

Resetting the playing item only makes sense when there is no already
active input; NextItem() takes care of that from LoopRequest():

This code was redundant since the playlist was made tick-less (the
rebuild date check made no sense anymore).

b_active_videoplayback was not set up correctly when we wanted to prevent sleep.

(forward ported from 2.0 branch)

works with transform filter now too, fixes #7437 again.