Duplicated sourceMappingURL for worker bundles

[Karshilov]

Describe the bug

After this issue has been resolved, there is no need to add sourceMappingURL manually for worker, and I even noticed a TODO about it.

Now every bundled worker script will have two sourceMappingURL comments if build.sourcemap has been set as true or "inline".

Reproduction

https://stackblitz.com/edit/vitejs-vite-xnuxz2?file=dist%2Fassets%2Flog-8dd97f70.js

Steps to reproduce

1. add an inline worker script
2. set build.sourcemap as true or "inline" in vite.config.ts
3. run pnpm install followed by pnpm build
4. check the bundled worker script and there is two sourceMappingURL

System Info

System:
    OS: Windows 10 10.0.19044
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 5.96 GB / 15.90 GB
  Binaries:
    Node: 16.17.0 - 
    npm: 8.15.0 - 
  Browsers:
    Edge: Spartan (44.19041.1266.0), Chromium (108.0.1462.54)
    Internet Explorer: 11.0.19041.1566
  npmPackages:
    @vitejs/plugin-vue: ^4.0.0 => 4.0.0
    vite: ^4.0.0 => 4.0.4

Used Package Manager

pnpm

Logs

No response

Validations

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• The provided reproduction is a minimal reproducible example of the bug.