Fixed validation failing when there was a whitespace between the currency symbol and amount in a String price.

The current validator was failing when we tried to use values like those:

product.price = "$ 123,456.89"
product.price = "R$ 123.456,78"

The problem was that abs_raw_value wasn't striping whitespaces after removing the currency symbol.

PS. That's like my first time sending a pull request, so I'm not sure if I did everything right.