fix: Remove unneeded entry from an identity source map

[kota65535]

Thank you for releasing v5.0.0-rc.1!
I'm trying it in my projects to confirm #101 is now resolved, but found a little bug.

As I stated here, we create an identity source map to ensure the 1st and the 2nd instrumented codes have the same number of lines. More precisely, the identity source map and the source map obtained by this.getCombinedSourcemap() must have the same number of entries, otherwise the final source map will have incorrect line numbers.

This PR removes the unneeded file entry from an identity source map.

    inputSourceMap: {
      version: 3,
      mappings: "AA2BI,mBAGM,cAHN;;;;;;;;;...",
      names: ["useEffect", "useState", ...],
      sources: ["/mnt/src/pages/index.tsx"],
      file: "/mnt/src/pages/index.tsx"          // <- NOT NEEDED!
    },

[iFaxity]

Hello @kota65535,

I see, yes I see, good find. I will accept the PR and queue it out for a new release on the the "next" tag.

[github-actions]

🎉 This PR is included in version 5.0.0-rc.2 🎉

The release is available on:

• npm package (@next dist-tag)
• GitHub release

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