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

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

resources/classes/groups.php

@@ -55,16 +55,6 @@ if (!class_exists('groups')) {
 				$this->app_uuid = '2caf27b0-540a-43d5-bb9b-c9871a1e4f84';
 		}
 
-		/**
-		 * 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
 		 */