update icon: web3js (original, plain)

[canaleal]

Double check these details before you open a PR

• PR does not match another non-stale PR currently opened

Features

This PR closes #2232

Notes

Update the name of the original and plain file. Not SVG updates made.

[github-actions]

Hi!

I'm the check-bot and we have some issues with your PR:

devicon.json is not sorted correctly.
Please make sure that your icon is added in the `devicon.json` file at the correct alphabetic position
as seen here: https://github.com/devicons/devicon/wiki/Updating-%60devicon.json%60

Check our CONTRIBUTING guide for more details regarding these errors.

Please address these issues. When you update this PR, I will check your SVGs again.

Thanks for your help,
SVG-Checker Bot 😄

[Snailedlt]

Since this icon is not yet released there's no major version change needed. This needs to be merged before the next release, otherwise we'll have to make a breaking change

[weh]

Thank you 👍