Update face unlocked string when a11y is enabled

If face unlocked the device and a11y is enabled, tell
the user that face unlocked their device & they can
swipe up to open (instead of telling them to press
to open when UDFPS is supported).

Test: atest KeyguardIndicationControllerTest
Fixes: 195615155
Change-Id: Ic15c1efb17283d1e2843a200c3ff4a66eb8b6230