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[CrOS Customization] Update app icons

Includes icons for the Settings, Wallpapers, and Keyboard Shortcuts
apps.

Screenshot: https://screenshot.googleplex.com/7KdMiBkMFH7fuxh.png

Change-Id: I6cf1d45d78f36caeb1429629cc0067b1cbd57daa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429395
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810376}