fix: Fixes boolean/string comparison.

The identities are coming from the presence and all values there are string.

JitsiParticipant.js

      * recorder).
      */
     isHiddenFromRecorder() {
-        return Boolean(this._identity?.user?.['hidden-from-recorder']);
+        return this._identity?.user?.['hidden-from-recorder'] === 'true';
     }
 
     /**