Price representation fix

Prices where the decimal is a power of 10 (Examples: 1.10, 1.20 ect..) use to show as 1.1 or 1.2. This pull request fixes that and now shows them properly using the NumberFormat class.

**Added**
* N/A
**Removed**
* N/A
**Fixed**
* Prices sometimes showing wrong when the decimal is a power of 10.

**Tested?**
I sadly couldn't test this in a minecraft server because the maven script can't find dtlWallets. However, I did test what NumberFormat *should* print out in a basic console program. Since this is such a small change, I don't think it would break anything, however I could be wrong about that.