[3.4.x] Player: fix video rendering for multiple items in a row

Media referenced from playlists or media lists retrieved through libvlc like SMB folder listings can pretend to be audio-only on when parsing did not complete. Future metadata updates include the correct examination result, so the vout needs to be set again as audio-only is no longer true.

Fixes #1597 (closed)

(cherry picked from commit 3cf8833b)