Correct returns if PCC is enabled.

Before it was just using the general flags to see if the PCC enabled and
PCC service names are set to determine if PCC is enabled. This change
will get those values for the user instead.

Fixes: 283849162
Test: android.autofillservice.cts.dialog.LoginActivityTest
Change-Id: Id9baa2611ad9d1a8abf05896604609d2e35b7947