Ignore AGPS toggle during user-initiated emergency calls

* The location toggle itself is already ignored during
  emergency calls.
* Also ignore the AGPS toggle during that to not
  change behavior around emergency calls, we never
  want to affect those, because life is everything.

Issue: calyxos#1490
Change-Id: Iab13be99ccd65e0fdabcb67a25d73944ef24556a