Fix where country change results in emergency number update failure.

Clearing the current database version on emergency country ISO change
ensures that when the emergency numbers are updated from the database that
we will refresh the most recent values.

Bug: 173456532
Test: unit test; phone screen verified
Change-Id: I377fa53111dfcffd92d050b652b3ed29c8354492
Merged-In: I377fa53111dfcffd92d050b652b3ed29c8354492
(cherry picked from commit a8d6cbf4)