Do not enable erp5_ui_test_preference if it is already enabled.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@28034 20353a03-c40f-0410-a6d1-a30d3c3de9de

bt5/erp5_ui_test/SkinTemplateItem/portal_skins/erp5_ui_test/ListBoxZuite_reset.xml

@@ -112,7 +112,8 @@ pref = getattr(context.portal_preferences, "erp5_ui_test_preference", None)\n
 if pref is None:\n
   pref = context.portal_preferences.newContent(id="erp5_ui_test_preference", portal_type="Preference")\n
 pref.setPreferredListboxListModeLineCount(10)\n
-pref.enable()\n
+if pref.getPreferenceState() == \'disabled\':\n
+  pref.enable()\n
 \n
 return \'Reset Successfully.\'\n
 </string> </value>

bt5/erp5_ui_test/bt/revision

-440
+441
\ No newline at end of file