Adds decimal step to price input

[sync-by-unito[bot]]

fixes #476

https://deploy-preview-480--staging-merch-stores.netlify.app/

Steps to test:

• Go to any merchstore, any product
• Edit price
• Input a decimal

Expected result: You should be able to input a decimal number like "123.23"

┆Issue is synchronized with this Wrike Item by Unito

[sync-by-unito[bot]]

➤ levilowell commented:

This is working correctly (Safari) spencegarcia Only issue, is if you input the original value, the price depicts as a discount on the front end. https://user-images.githubusercontent.com/64867206/134201200-9a44cc99-e02a-4108-9763-ea4e15523445.png