fix: normalize override file path in windows (#692) (close: #642)

[jingzhe]

Fix escape characters in windows, such as "\n" (close: #642)

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[ulivz]

LGTM, Thanks.

[ulivz]

Released it in a patch (0.13.1), you can try it by upgrading your vuepress.

[jingzhe]

new version 0.13.1 works perfectly. Thanks.

[NonPolynomial]

This have also to be done in the 1.x.x versions.