WS2-1636: fix(unity-bootstrap-theme): fix anchor menu styles to match XD

[bebaps]

Description

Currently, the Anchor Menu :focus and other small styles do not match the XD file, causing oddities when an item is in a focus state. This PR fixes anchor menu styles to match the XD specs in this regard.

Links

• JIRA ticket

Checklist

• [x] Unity project successfully builds from root yarn install & yarn build
• [x] Commits do not contain multiple scopes
• [x] No new console errors

Browsers

• [x] Chrome
• [x] Safari
• [x] Firefox

Images