fix: correctly check index file exists when resolving an entry

[eltigerchino]

fixes #13350

#13188 caused a regression where index.js and index.ts files would not be resolved as entries because of the additional isFile() check that was added to prioritise matching files over folders.

kit/packages/kit/src/utils/filesystem.js

Line 187 in 2ca09ce

return file.replace(/\.(js|ts)$/, '') === base && fs.statSync(path.join(dir, file)).isFile();

This PR fixes it by including the .js and .ts extensions when checking if an index file exists. Previously, it only checked without the extensions, hence the condition never passed.

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@sveltejs/kit	Patch

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