Remove explicit permission definitions on wagtailimage.Image as they clash with the auto-created ones

wagtail/wagtailimages/models.py

@@ -105,13 +105,6 @@ class AbstractImage(models.Model, TagSearchable):
 class Image(AbstractImage):
     pass
 
-    class Meta:
-        permissions = (
-            ('add_image', "Can add image"),
-            ('change_image', "Can change image"),
-            ('delete_image', "Can delete image"),
-        )
-
 
 # Receive the pre_delete signal and delete the file associated with the model instance.
 @receiver(pre_delete, sender=Image)