Fix bad character escape sequence in typography.js on Windows

[JGameCreation]

Fixes the issue discussed here lately: #1669
This replace single backslashes on windows with double backslashes. Without this the following error occurs on Windows machines:

Error: Module parse failed: C:\src\node_modules\gatsby-plugin-typography.cache\typography.js Bad character escape sequence (1:56) You may need an appropriate loader to handle this file type. SyntaxError: Bad character escape sequence (1:56)

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[JGameCreation]

Could someone please explain to me why the checks failed? This was my first commit and I have no idea.

[KyleAMathews]

@JGameCreation woah nice fix! This looks like what we need to do for #1783 as well! @bskimball

On failing stuff — you jumped in the Gatsby waters during a bit of unstability. PRs are in progress/done with fixes. I'll finish those and merge them into this PR.

Thanks again!

[kylegalbraith]

Wow beat me to it @JGameCreation! A million thank yous.

[jlengstorf]

Hiya @JGameCreation! 👋

This is definitely late, but on behalf of the entire Gatsby community, I wanted to say thank you for being here.

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