shortcuts: Update app name to Key Shortcuts

Screenshot: https://screenshot.googleplex.com/AFY8BYTAove4qgY
Screenshot: https://screenshot.googleplex.com/6jL5E7dh6cCPysC

Bug: b:216049298
Test: none
Change-Id: I65dca6cb4c39c36ff3486ae283adc6124ac01910
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4548485


Reviewed-by: David Padlipsky <dpad@google.com>
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1148678}