Tweak vertical alignment of tab badges

[matthew-white]

This PR makes small adjustments to the vertical alignment of tab badges. It attempts to address getodk/central#671 (comment).

What has been done to verify that this works as intended?

Trying it out locally.

Before submitting this PR, please make sure you have:

• run npm run test and npm run lint and confirmed all checks still pass OR confirm CircleCI build passes
• verified that any code or assets from external sources are properly credited in comments or that everything is internally sourced

[lognaturel]

@matthew-white will put this on the QA server so Szymon can verify it because he's the only one who can reproduce currently.

[matthew-white]

In the time since I created this PR, I've seen other cases where vertical alignment is correct on my machine, but not correct for Szymon. This PR just makes changes to tab badges, but I'm thinking that the issue is probably more systemic. I've filed getodk/central#963 about this issue. I'll go ahead close this PR.