Revert "Update a11y strings for flexible split"

This reverts commit c8a349c8.

Reason for revert: Revert for 25Q3-release branch only. Fixes b/422912855. Will be fixed forward in main branch.

Bug: 415827083
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:379f6c5338098f5a68aa663e95a7ff8b49085225)
Merged-In: I05f75472e86588d82b27278b395cb70c885f1afa
Change-Id: I05f75472e86588d82b27278b395cb70c885f1afa