Fixed bug causing user to be stuck on face intro

Test: See below
Fixes: 203375738
Change-Id: I3e59191a8c936c7c7a3d8561e908593dbf9710b5

1. Enrolled a face during SUW
2. Pressed back on fingerprint enroll intro
3. Verified that the next button's text is chnaged to done
4. The done action launches the fingerprint enroll intro flow.

Change-Id: Id5d652257445e40426ade3d396a31ebf936cc348