Repopulate cache with sibling visibility on remove

This change ensures that we re-add the visibility state of a shared user
id when one of its members is removed. Prior to this change, we were
removing the app ID (and thus all other members of the shared uid) but
only recomputing on the removed setting, which we ignore in the update
(essentially an expensive no-op). This change ensures that we run
through the shared settings and re-compute with them instead.

Fixes: 159197157
Test: atest AppEnumerationTests SharedUidPermissionsTest
Change-Id: I85250e4264888ac8583a2b4798ff6a2f93d6a74d
(cherry picked from commit 5c5ac45e)