[YouTube] Fix search filters messing with which lockup formats are extracted

[Stypox]

Followup for #1338: LOCKUP_CONTENT_TYPE_VIDEO was only being extracted if extractPlaylistResults is true, which meant:

• if no filter was active, both playlists and videos were extracted as expected
• if only playlists were active, both playlists and videos were extracted, while only playlists should have been
• if only videos were active, no LOCKUP_CONTENT_TYPE_VIDEO were extracted, which is obviously wrong

This PR fixed that.

• I carefully read the contribution guidelines and agree to them.
• I have tested the API against NewPipe.

Fixes TeamNewPipe/NewPipe#12466.