bugfix: allow proper currency rendering in case of discount coupons applied

Description

The currency is currently hard-coded for the discount applied part on checkout page. This PR attempts to resolve it

1. My default currency is Rs. (Indian National Rupee). In case of
coupons, the discount applied was being rendered in dollars.

2. The discount currency should be the same as the default currency, and
hence the code change

Status

Assignee

Unassigned

Reporter

Open Source Pull Request Bot

Contributor Name

Pulkit Pahwa

Repo

edx/ecommerce

Customer

None

Epic Link

None

OSCM Assignee

None

Platform Map Area (Levels 1 & 2)

None

Platform Map Area (Levels 3 & 4)

None

Priority

Unset
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