Fixes string reference in SEARCH_INDEX_DATA_PROVIDER and minor changes to UI based on UX review.

Bug: 34682532

Test: ag/1813674 and manual testing with TalkBack, Switch Access, S2S, and Accessibility Scanner.

Undo "Revert "Accessibility settings refresh.""
This reverts commit 31d855e7.

Change-Id: I7187250e8070418894aee4ee6c8c5d8282339c82