"Play Now" button doesn't queue properly

Steps to reproduce

1. Open an album
2. Click "Play Now" on one track
3. Click "Play Now" on another track
4. Observe the behavior

What happens?

During 2; "Play Now" doesn't play now - instead, it adds the track to the queue. During 3; "Play Now" starts playing the track added in step 2.

What is expected?

"Play Now" should start playing the track in place, no matter what state the queue is in.

Context

Already reported on Matrix channel.

Funkwhale version(s) affected: develop @ fd1ce6ef