this modifies AuthEditBase so that if there is a sync inputpanel specified,
we display it in a second tab (we need to modify the bodyPadding here,
else the whole window has too much padding)
we use the same panel for both ldap/ad, since the most options behave
the same (except for user_attribute, but the default for AD is
sAMAccount which i think is good enough for now, users can still
override it in the cli)