bugfix: hold music fetched when conference member removed from hold

lib/tasks/conference.js

@@ -453,7 +453,7 @@ class Conference extends Task {
         this._playSession = null;
         break;
       }
-    } while (!this.killed && this.conf_hold_status !== 'hold');
+    } while (!this.killed && this.conf_hold_status === 'hold');
   }
 
   /**