Issue #3310939: Fix 'Invalid resource argument' error.

Issue #3310939: Fix 'Invalid resource argument' error.

src/Plugin/ImageToolkit/Operation/gd/AddWatermark.php

@@ -97,8 +97,6 @@ class AddWatermark extends GDImageToolkitOperationBase {
         return FALSE;
     }
 
-    $this->getToolkit()->setResource(TRUE);
-    imagedestroy($image_resource);
     return TRUE;
   }