CSR-2091

CSR-2091 amount due showing as $NaN because it is adding the string values returned from getSubTotal and getSalesTax.  Use the unary operator to convert to numeric before adding.

src/fmg-components/cart/cart.vue

@@ -930,7 +930,10 @@ export default {
             if (!this.showAsPaid) {
                 return 0;
             }
-            return this.subTotal + this.salesTax;
+
+            // unary plus operator to convert string amount to numeric so we can add them together
+            var amtPaid = +this.subTotal + +this.salesTax;
+            return amtPaid;
         },
     },
     components: {