chore: remove some BFR-related TODOs that are not valid anymore

Signed-off-by: Deluan <deluan@navidrome.org>

core/artwork/artwork_internal_test.go

@@ -15,7 +15,7 @@ import (
 	. "github.com/onsi/gomega"
 )
 
-// BFR Fix tests
+// TODO Fix tests
 var _ = XDescribe("Artwork", func() {
 	var aw *artwork
 	var ds model.DataStore

core/scrobbler/play_tracker_test.go

@@ -239,7 +239,6 @@ func (f *fakeScrobbler) Scrobble(ctx context.Context, userId string, s Scrobble)
 	return nil
 }
 
-// BFR This is duplicated in a few places
 func _p(id, name string, sortName ...string) model.Participant {
 	p := model.Participant{Artist: model.Artist{ID: id, Name: name}}
 	if len(sortName) > 0 {