also str representation of unicode character is different.

The logic of the patch accidentally changed in 240a8d26 (
{,Propertied}User: Reduce the overhead from Developer role processing.,
2019-02-14). This used to be a patch to not consider 'Developer' as
a local role in SimpleUser.getRolesInContext , but it was changed to
not consider 'Developer' role at all - also as a global role.

SimpleUser are users from the the root acl_users, users from
erp5/acl_users will typically be PropertiedUsers, because this is a PAS
user folder.

Call the original method instead of copy/pasting the code

We still keep the following patches:
 - user: this is an ERP5 addition and maybe we use it in customer project
   code (if we don't I'm in favor of removing the feature, it's used in
   only one place in this repo)
 - call `self.changeSkin(self.portal.getCurrentSkinName())`. Maybe this
   is needed for CMFCore tests and could be good to send upstream, I did
   not check this part