Default isUserSwitcherEnabled showEvenIfNotActionable

In ag/11573771, the default value for isUserSwitcherEnabled() was
put as false, but it was supposed to be true (as it had been
in patch 1 of that cl).

Bug: 157881376
Test: manual
Change-Id: I456e7eb9527dad8da5d5f99ecbfc8bcf40b7bdcc