feature request: format currency with standard amount of decimals

[7596ff]

If gas is $1.80 a gallon, the fill-up list displays this as $1.8. This could be fixed by adding something similar to line 30 of the same component: https://github.com/linuxserver/Clarkson/blob/master/src/app/components/fuel-list/fuel-list.component.html#L30

I however am not sure if this is applicable to all currencies.