Fix #357 - Added check for REPLACED TrackEndReason

Created by: xt449

Make sure you familiarize yourself with our contributing guidelines.

Summary

Fixes #357 (closed) LavalinkGuildConnection#InternalPlaybackFinishedAsync now check that the TrackEndReason is not Replaced before setting the current track to default.

Details

InternalPlaybackFinishedAsync now works properly for TrackEndReason.Replaced

Changes proposed

Add

if (e.Reason != TrackEndReason.Replaced) this.CurrentState.CurrentTrack = default;

as proposed by #357 (closed)