refactor: handle overriding currency decimal places

[alexbarnsley]

Summary

related to https://app.clickup.com/t/86dugrp91

Mainsail will handle 18 decimal places instead of 8, so this is to allow changing that while also remaining backwards compatible

Checklist

• I checked my UI changes against the design and there are no notable differences
• I checked my UI changes for any responsiveness issues
• I checked my (code) changes for obvious issues, debug statements and commented code
• I provided a screenshot of my changes to the component (if applicable)
• I regenerated the icons.html file and checked if my newly added icon is shown correctly (if necessary)
• I added an explanation on how to use the component to the readme (if necessary)
• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[alexbarnsley]

I'm happy to close this as I don't believe it's required. Everywhere it's used we pass in a decimal value. The only time it doesn't is when using the <x-currency component, but that can also be overridden in the component if we need to do so.

@ItsANameToo it won't cause issues if it's merged, but I'll leave it up to you :oleglala:

[ItsANameToo]

closing for now, can be added once we need it for something