/cart: Add currency filter to cart views

https://docs.angularjs.org/api/ng/filter/currency

Using Angular currency filter to add '$' symbol and truncate to two decimals.

!important: When there is more than 1 quantity of certain products, prices are returning with repeated decimals.

    Example: https://api.azurestandard.com/product/CH197

    Quantity 2, total price: $233.39999999999998
    Using currency filter: $233.40

The currency filter cleans the price up nicely, but unsure if this will affect Beehvive prices.