Fix search icon on search input

[benizz0]

When edit --pico-form-element-spacing-horizontal
Exemple (set to 1px) :
From :

To :

[lucaslarroche]

@benizz0, thank you for spotting it and for the PR.

Note that you did not generate all the CSS files.
I can do it, but if you want to do it, here's how to do it:

1. Install the dependencies: yarn
2. Lint all the files, build and minify all the CSS files: yarn build.

You should end up with 233 changed files 🙂

[benizz0]

Hello @lucaslarroche,
it's done !

[lucaslarroche]

Thanks. Merged, it will be released this weekend with v2.0.1