Use category rather than new proeprty.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33569 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/PropertySheet/Gadget.py

@@ -55,11 +55,6 @@ class Gadget:
     , 'type'       : 'string'
     , 'mode'       : 'w'
     },
-    { 'id'         : 'gadget_type'
-    , 'description': 'A gadget type makes it easy to make specific gadgets for a specific ERP5 view'
-    , 'type'       : 'tokens'
-    , 'mode'       : 'w'
-    },
   )
 
-  _categories = ()
+  _categories = ('gadget_type',)