don't use attname in the ORM update kwargs, not recognised

[anentropic]

I had a denormalised field like:

@denormalized(models.ForeignKey, to='Team', null=True, blank=True)
@depend_on_related('Team', foreign_key='member')
def team(self):
    i, team = self._team_and_member_index()
    return team.pk

When I tried to ./manage.py denorm_rebuild (or do a rebuildall() in python console) I was getting the error:

FieldDoesNotExist: Member has no field named 'team_id'

I think it's wrong to try and use the attname in the update query... this fixes it for me and I'm pretty sure shouldn't break anything else.

[anentropic]

I'm on Django 1.5 in case that matters

[xaralis]

Can you merge this one? I'm having same issue and this really seems to fix it. On Django 1.6.2.

[xaralis]

Strange is, that this doesn't happen everytime though. On many instances it works and then suddenly, for one particular it fails.