Lint player.js

Follow lint indications :
- https://github.com/iv-org/invidious/pull/2895#discussion_r809461103
- https://github.com/iv-org/invidious/pull/2895#discussion_r809461622

assets/js/player.js

@@ -185,9 +185,7 @@ player.playbackRate(video_data.params.speed);
  * @returns cookieValue
  */
 function getCookieValue(name) {
-    var value = document.cookie.split(";").filter(item => {
-        return item.includes(name + "=");
-    });
+    var value = document.cookie.split(";").filter(item => item.includes(name + "="));
     return value != null && value.length >= 1 ? value[0].substring((name + "=").length, value[0].length) : null;
 }