add focus styling for settings dropdown trigger button

[thema-d]

This change adds a focus style to Settings Dropdown trigger button in a similar manner to the Teams Dropdown.

The following screenshots show the focused state of the buttons before and after.
P.S: I have bumped up the background color of the buttons in the screenshot for the sake of contrast.

Before

After

[driesvints]

I think the current behavior is more desireable. The former is a switcher while the latter is a dropdown.

[thema-d]

Hi @driesvints, Thanks for replying.
What about when navigating using a keyboard? The Trigger button will be focused but no indication that it can be clicked or so.

[driesvints]

ah sorry, didn't realize this was a focus style. Seems okay to me 👍