Update math-input to the latest version
Update math-input to the latest version

Makes our new linter happy, re:
https://phabricator.khanacademy.org/rGMIe58d88debe2ad564a9a0db89369a4ecc51b02c2b

Auditors: emily

Test Plan:

`ka-lint`

(`react-components` still fails, but `math-input` is good to go!)

ariabuckles/perseus,ariabuckles/perseus,ariabuckles/perseus,ariabuckles/perseus,learningequality/perseus,learningequality/perseus