fix remove_callback

AvocadoEdition_Light/lib/Hook/hook.extends.class.php

@@ -123,13 +123,15 @@ class GML_Hook extends Hook
       return false;
     }
 
+    $is_remove = false;
+
     foreach ($array[$tag][$priority] as $key => $value) {
       if (isset($value['function']) && $value['function'] === $func) {
         unset($array[$tag][$priority][$key]);
-        return true;
+        $is_remove = true;
       }
     }
 
-    return false;
+    return $is_remove;
   }
 }