Duplicate worker code inside bundle file with inline option

Hi!

When using inline option in the config, I found duplicate worker code in my bundle.
Perhaps this is because of incorrect use of `createObjectURL` and `revokeObjectURL` in the case of `inline: true` option.
I believe in line 186 👇, the argument of `URL.revokeObjectURL` should not be a string with all the worker code inside it, but it should be a product of `URL.createObjectURL` method.

https://github.com/developit/workerize-loader/blob/99d98e4f14e83cff28b9269660964d5424d865bb/src/index.js#L186

Start in src/index.js at the linked code around line 186 and inspect how createObjectURL and revokeObjectURL are used when inline is true. Reproduce an inline build, compare the generated bundle with the non-inline case, and confirm that the worker code appears only once.

Scritto dal modello di indicizzazione a partire dal testo della issue.