Update playback position slider also when track is paused

Fixes the UI not updating when clicking the position slider while playback is paused.

Fixes #1266

changes/changelog.d/1266.bugfix

@@ -0,0 +1 @@
+Update playback position slider also when track is paused (#1266)

front/src/components/audio/Player.vue

@@ -551,6 +551,10 @@ export default {
         this.updateProgressThrottled.cancel()
       }
       this.currentSound.seek(t)
+      // If player is paused update progress immediately to ensure updated UI
+      if (!this.$store.state.player.playing) {
+        this.updateProgress()
+      }
     },
     ended: function () {
       let onlyTrack = this.$store.state.queue.tracks.length === 1