Updated misc. settings icon

This isn't the main app icon, but rather a 24dp version used in a few
miscellaneous places in the app. This also removes the outdated inverse
version of the previous icon since the new version now works in either
context.

Bug: 77982107
Test: manual
Change-Id: Ibd5928895ac1aba52b64a853c4ccd806a2f1de70