trim whitespace on value_to_currency when string

[salimshopbou]

Encountered an issue with whitespace in the value_to_currency method here

Ideally we shouldn't have leading or trailing whitespace for currencies passed in, but this is a simple bit of string preprocessing that might help alleviate some unintended errors.

[elfassy]

the ideal solution here is to fix the data in the database. There could be other systems that look at this value and would not get this fix (ex: something that does a currency conversion). The currency is usually not something our users input into our system, so it should not be susceptible to typos. Fixing this here would make it harder to find the root of the issue. Let me know if there's something I'm missing