Vector: Restore old focus animation on the "More" dropdown

Per post-merge review of I09c8031c, it's not consistent with anything
we have elsewhere.

Bug: 66363
Change-Id: I89cf29fcb92d29d782c4091f39879f3837579bdb
(cherry picked from commit 443c7b894a369c303f74a502e761154b0d7ea133)