Apply fixes from StyleCI

src/Grid/Actions/Delete.php

@@ -3,7 +3,6 @@
 namespace Dcat\Admin\Grid\Actions;
 
 use Dcat\Admin\Grid\RowAction;
-use Dcat\Admin\Support\Helper;
 
 class Delete extends RowAction
 {

src/Grid/Concerns/HasTree.php

@@ -10,9 +10,8 @@ use Dcat\Admin\Support\Helper;
 use Illuminate\Support\Collection;
 
 /**
- * Trait HasTree
+ * Trait HasTree.
  *
- * @package Dcat\Admin\Grid\Concerns
  *
  * @method \Dcat\Admin\Grid grid()
  */

src/Tree.php

@@ -317,6 +317,7 @@ class Tree implements Renderable
     {
         return $this->disableSaveButton(! $value);
     }
+
     /**
      * Disable refresh.
      *