Remove remains of previous player.

Fixes an issue where the spinner/loading from a previous player can show up in a cached page.

src/components/Player.vue

@@ -255,6 +255,7 @@ export default {
             this.player = undefined;
         }
         if (this.hotkeys) this.hotkeys.unbind();
+        this.$refs.container.querySelectorAll("div").forEach(node => node.remove());
     },
 };
 </script>