[issue] Small typo in ox-html

[Gerry Agbobada]

There's a small typo in latest ox-html commits

https://code.orgmode.org/bzg/org-mode/src/master/lisp/ox-html.el#L244

The "code-highlighted" string needs to keep the escaped ". It breaks
otherwise. (exact commit :
https://code.orgmode.org/bzg/org-mode/commit/68fa5e589f00c8d5b4f7f0dc70be6ebe59238bb8
)

I don't know any other way to convey this issue, sorry if it's not the
correct way

Thanks for org-mode, and have a good day !
Gerry AGBOBADA