fix(plugin-vue): properly select the main module during hot update (fix #4150)

[paraboul]

fix #4150

Description

moduleGraph contains 2 entries for the SFC being updated :

• One with index.css as the only importer (because Tailwind JIT tells that every purgeable files are a deps of the generated css (index.css)).
• Another one with the "right" importer (the parent component or the js file where the component is imported).

This fix tries to better select the "main module" being selected during handleHotUpdate by selecting one with an id set.

Additional context

I'm not super familiar with the code and so, i'm not 100% if there are legit cases where id property is missing

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[paraboul]

Ok closing, after further testing, it seems that it's not properly propagating updates to index.css when introducing a new inlined tailwind classe in the affected module.