Removed the buffer.Length() check that was causing intermittent test failures.
The background goroutine started by newBufferedScrobbler can process and
dequeue scrobble entries before the test assertion runs, leading to a race
condition where the observed length is 0 instead of 1. The Eventually block
that follows already verifies the scrobble was processed correctly.
Signed-off-by: Deluan <deluan@navidrome.org>
f14692c1f0