remove unneeded destruct methods as GC has higher performance (#6631)

Co-authored-by: Tim Fry <tim@voipstratus.com>

app/conference_controls/resources/classes/conference_controls.php

@@ -60,16 +60,6 @@ if (!class_exists('conference_controls')) {
 				$this->app_uuid = 'e1ad84a2-79e1-450c-a5b1-7507a043e048';
 		}
 
-		/**
-		 * called when there are no references to a particular object
-		 * unset the variables used in the class
-		 */
-		public function __destruct() {
-			foreach ($this as $key => $value) {
-				unset($this->$key);
-			}
-		}
-
 		/**
 		 * delete rows from the database
 		 */