fix: escape css

[JSerFeng]

Summary

fix css escape, css modules local ident should not be escaped in javascript module

.a\/b { }

The above css module contains a class a/b, if it becomes .local-a/b {}, the corresponding value in js should be local-a/b not local-a/b, local ident name in js should not be escaped

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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