remove a duplicate

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39218 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Document.py

@@ -76,7 +76,7 @@ VALID_IMAGE_FORMAT_LIST = ('jpg', 'jpeg', 'png', 'gif', 'pnm', 'ppm', 'tiff')
 
 DEFAULT_DISPLAY_ID_LIST = ('nano', 'micro', 'thumbnail',
                             'xsmall', 'small', 'medium',
-                            'large', 'large', 'xlarge',)
+                            'large', 'xlarge',)
 # default image quality
 DEFAULT_IMAGE_QUALITY = 75