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Fix font size of MathJax 3 inline math (#643)

## Summary:
PR https://github.com/Khan/perseus/pull/631 updated the font styling for
KaTeX to also apply to MathJax. These styles got broken by a merge, so
this commit fixes them up.

Issue: https://khanacademy.atlassian.net/browse/LC-1087

Test plan:

Follow the instructions in webapp's
`services/static/javascript/perseus/README.md` to install a dev build of
Perseus. View math in the following situations with `?devflagk=mathjax3`
appended to the URL and verify that it looks like the math on prod:

- /devadmin/tex
- /devadmin/tex/testcases
- A math article, e.g. /math/multivariable-calculus/thinking-about-multivariable-function/x786f2022:vectors-and-matrices/a/vectors-and-notation-mvc
- A math exercise
- Graphie labels
- The exercise editor (note the color contrast between math and the surrounding text in the mobile preview).
- An interactive graph
- A passage widget
- A plotter widget

Author: benchristel

Reviewers: handeyeco, nixterrimus

Required Reviewers:

Approved By: handeyeco

Checks: ✅ finish_coverage, ✅ Publish npm snapshot (ubuntu-latest, 16.x), ✅ Lint, Typecheck, and Test (ubuntu-latest, 16.x), ✅ Extract i18n strings (ubuntu-latest, 16.x), ✅ Cypress Coverage (ubuntu-latest, 16.x), ✅ Check builds for changes in size (ubuntu-latest, 16.x), ✅ Jest Coverage (ubuntu-latest, 16.x), ✅ Check for .changeset file (ubuntu-latest, 16.x), ✅ gerald

Pull Request URL: https://github.com/Khan/perseus/pull/643

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