Fix small lint errors found by gocritic

core/scrobbler/buffered_scrobbler.go

@@ -8,7 +8,7 @@ import (
 	"github.com/navidrome/navidrome/model"
 )
 
-func NewBufferedScrobbler(ds model.DataStore, s Scrobbler, service string) *bufferedScrobbler {
+func newBufferedScrobbler(ds model.DataStore, s Scrobbler, service string) *bufferedScrobbler {
 	b := &bufferedScrobbler{ds: ds, wrapped: s, service: service}
 	b.wakeSignal = make(chan struct{}, 1)
 	go b.run()

core/scrobbler/play_tracker.go

@@ -53,7 +53,7 @@ func GetPlayTracker(ds model.DataStore, broker events.Broker) PlayTracker {
 		for name, constructor := range constructors {
 			s := constructor(ds)
 			if conf.Server.DevEnableBufferedScrobble {
-				s = NewBufferedScrobbler(ds, s, name)
+				s = newBufferedScrobbler(ds, s, name)
 			}
 			p.scrobblers[name] = s
 		}