Re-inflate views in onOverlayChanged.

onThemeChanged had been used to re-inflate changes, but
ag/6670184 modified onThemeChanged to exit early if the
ThemeResId hasn't changd. A style change doesn't change
the ThemeResId, so re-inflating views in onOverlayChanged
so that font, etc. will update.

Fixes: 129870891
Test: Lock screen font changes with style change.
Change-Id: Ib4aecb017012d5035753fdc3a71615cb7b5216ce