fix: prevent hooks.server code being imported into client during build

[CaptainCodeman]

Server side code inside a src/hooks.server folder can result in the build trying to import the code into client side code, usually causing the build to break.

Reproduction: https://www.sveltelab.dev/egkmtnbmy05petz (execute npm run build)

It's due to the file suffix being stripped off so hooks.server matches a search for hooks when the code is looking for universal hooks. This makes the suffix matching stricter to only strip .js or .ts (AFAICT, those are the only things that should ever be matched with this fn).

Fixes: #11754

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[eltigerchino]

Thank you!