Filters should be applied to all vouts by the interfaces

The following discussion from !6006 (merged) should be addressed:

• @tguillem started a discussion: (+7 comments)

  We can only decide if video filters should be applied to only the main window or all vouts (or all future vouts).

  Any other improvements should be postponed until 5.0 with a proper vlc_player + libvlc filter API.

VLC 4.0 reworks on the video output have led to a feature regression from VLC 3.0.

Filters are now, only applied to the primary vout, which is a great show that a filter chain to will persist for the vout lifetime.

Since we don't have the proper filter API (scheduled for 5.0) yet, we need to apply the filters to all the video outputs of the interfaces to keep stay consistent with the former VLC behavior.