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

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

app/extension_settings/resources/classes/extension_settings.php

@@ -61,16 +61,6 @@ if (!class_exists('extension_settings')) {
 				$this->location = 'extension_settings.php';
 		}
 
-		/**
-		 * 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
 		 */