fix(cli): whitespace and line-break support to style block

[hrishikesh-k]

Previously, I had submitted this PR: windicss/vite-plugin-windicss#257 which enabled me to use syntax like h = 20. I tried doing the same with <style> block. My code was like:

<style
  lang = "windi">
/* some stuff */
</style>

This never did anything until I changed my style block to:

<style lang="windi">
/* some stuff */
</style>

Because of the attributify mode, I'm trying to use all attributes of all tags in a new line to maintain consistency. Thus, when I did the way I did before, it was not working.

This PR changes the style block matching regex to match the above mentioned syntax. Please consider merging it.