fix code style 6

Author: Gianluca

src/Illuminate/Database/Eloquent/Model.php

@@ -447,8 +447,8 @@ public function qualifyColumns($columns)
 
         foreach ($columns as $column) {
             $qualifiedArray[] = $this->qualifyColumn($column);
-        }   
-        
+        }
+
         return $qualifiedArray;
     }