Revert "Update A11y strings for flex split"

This reverts commit 39ed2478.

Reason for revert: DroidMonitor: Potential culprit for b/421184598 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted

Bug: 421184598
Change-Id: I446c7fea6075ea9c73f4708d1891af87f4287af4