Matching: use queuMathJax instead of typesetPromise

[ascholerChemeketa]

I believe this should fix:
https://groups.google.com/g/pretext-dev/c/iIy3kSG-WqY/m/9IsTgEPjAgAJ?utm_medium=email&utm_source=footer

And possibly:
#762

I don't believe matching should be triggering a full typesetPromise on init. Depending on the timing, this can cause the typeset that is supposed to process the rest of the page to try to convert elements that have already been converted.

Definitely should only target its own content. Not sure about using queueMathJax, but that seems wise too.

[bnmnetp]

Thanks, the components should always use queueMathJax to ensure we are not trying to typeset multiple things at the same time. This one just didn't get updated from the initial prototype.