Touchpad settings' icons update

Two icons need to be updated:
1. The touchpad speed setting inside of the touchpad settings
2. The bottom right tap setting inside of the touchpad settings

https://screenshot.googleplex.com/5QKLTwX8qNrnRsj.png
https://screenshot.googleplex.com/7iHNKwzwAZm5h8N.png

Bug: 269100659
Test: manual
Change-Id: I776e94325b1f54475f406a2fe11c4db4a0205f40