Fixes #2286: added currency formatting

[Akarshit]

Resolves #2286, #2892
Impact: minor
Type: bugfix

Issue

The problem was formatting was only applied to the placeholder

Solution

Currency formatting is now applied to the value

Testing

1. Create a product
2. For a variant enter a price and an MSRP
3. Observe the price and MSRP are formatted as currency once out of focus.
4. Try to edit the value and then make them out of focus
5. Observe the price is again formatted as currency.

[spencern]

@Akarshit @zenweasel approving this, I think there is one more field that should be a currency field in the fulfillment "refund" step. We should use this same currency component there as well, though that can be a separate PR.