We were using the SubBaseActivity class for two different kind of
activities:
(1) "Wrapper" activities, where we define an activity that on
start simply launches another one
(2) "Interactive" activities, where the user has to manually
trigger the start of the subactivity, or skip the step.
When the subactivity ends, only in case (1) we want to finish our
activity as well, since we wouldn't have anything to show.
Change-Id: I1a3ae51f6146ac32b5e7542d9a18b0b032efe144
Set slide animation by default and use it in all pages.
Fix wrong/missing slide animations on various transitions like WiFi
and the backup subpage.
Change-Id: I78c87f38eb615379d39c89b43a016ed2ffb98695
