stylex.attrs doesn't work with dynamic styles when using multi-word properties

### Describe the issue

When using multi-word properties like `colorScheme`, the variables use kebab-case when inlined, but use camelCase in compiled CSS.

### Expected behavior

Variable names are synced between the inlined styles and compiled CSS.

### Steps to reproduce

1. Create dynamic styles with multi-word properties like `colorScheme`
2. Apply it with stylex.attrs

### Test case

_No response_

### Additional comments

_No response_