Solve deprecated warning using / for division outside of calc()

[hans2103]

Description

This PR will solve the Deprecated Warning created by Dart Sass

Screenshots (if appropriate)

Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div(-$choices-button-offset, 2) or calc(-$choices-button-offset / 2)

More info and automated migrator: https://sass-lang.com/d/slash-div

    ╷
129 │     margin-right: -$choices-button-offset/2;
    │                   ^^^^^^^^^^^^^^^^^^^^^^^^^
    ╵
    node_modules/choices.js/src/styles/choices.scss 129:19                @import

Types of changes

To solve the deprecated warning using / for division outside of calc() you can use math.div instead.
BUT... does math.div have a widespread support?
Dunno... on the other hand.... the multiplier * does have a widespread support.

SO instead of replacing / by math.div I propose to replace it by *
There are only five places in the code where the division is used and the numbers are simple

• replace /2 by * .5

• replace /4 by * .25

• Chore (tooling change or documentation change)

• Refactor (non-breaking change which maintains existing functionality)

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

There is no need to change the documentation

[mtriff]

Thanks for this! I agree your approach seems the most straightforward. Can you add the leading zeroes to .5 and .25? We should add stylelint to automatically detect and fix that, but for now...

[hans2103]

@mtriff leading zeroes have been added.

[mtriff]

Looks great, thanks!