fix: remove virtual module prefix while generating manifest

[sibbng]

Description

Closes #6097
Closes #6208

Thanks to @khalwat for letting me know about the issue.
Related: #5601 (comment)

Related: ElMassimo/vite_ruby#156
Related: nystudio107/craft-vite#20

/cc @StefSchenkelaars @ElMassimo I didn't tested this with latest version of vite-ruby but you might need to revert your changes.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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[ElMassimo]

Vite Ruby does not rely on the presence of this char, so no changes are required once this is merged.

[khalwat]

Thank you so much @sibbng !

[patak-dev]

Thanks for the fix @sibbng! Sorry for the regression, I didn't see how disruptive this problem was for the backend ecosystem until this PR. [email protected] includes this patch.
It would be good to improve our manifest tests and other parts related to your integrations. Please check our current CI tests and PRs for new cases so we avoid these problems in the future.