[BUG] Erroneous Decimal Formatting (Commas in Fractions)

[DeveloperAmrit]

[y] I have checked for duplicate issues

Description:
The decimalScaling helper applies a regex to add commas to the fractional part of a number.

How to Reproduce:
Call decimalScaling("123456", 6, 6).

Actual Behaviour:
Returns "0.123,456".

Expected Behaviour:
Should return "0.123456". Commas should only be used as thousands separators in the integer part.

Location: StablePay/djed-sdk/src/helpers.js

[y] I want to work on this issue