AVT - Keyboard focus indicator is not visible when drap-down list is selected

Summary

Any keyboard operable user interface the keyboard focus indicator should be visible.

Steps to reproduce

GitLab->Settings->General

What is the expected correct behavior?

Confirm a distinct visual focus indicator is present when the element (or component) receives focus.

Relevant screenshots

• [GitLab->Settings->General] @sharonchen @carmacleod

gitlab-ce~2677490