FIX: fix enumeration for modules.

Module does not have ID field. Instead, it has handler field.

app/Enumerations/Modules.php

@@ -12,10 +12,10 @@ class Modules extends BaseEnumeration
      */
     protected static function init()
     {
-        $modules = Module::all(['id', 'name']);
+        $modules = Module::all(['handler', 'name']);
 
         foreach ($modules as $module) {
-            self::push($module->id, $module->name);
+            self::push($module->handler, $module->name);
         }
     }
 }