[keyboard-alt]: Update right-click setting strings

Bug: b/279503977
Change-Id: I95a2c5a5dfa44e417a8f223f94c341ee77607c17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4747013


Commit-Queue: Michael Checo <michaelcheco@google.com>
Reviewed-by: Wes Okuhara <wesokuhara@google.com>
Cr-Commit-Position: refs/heads/main@{#1180432}