Fix: Rounding error prevented some bills from getting settled. This is related to the half even rounding in python.

bookie/src/app/sales/bill.service.ts

@@ -326,7 +326,11 @@ export class BillService {
           (t, k) =>
             k.inventories.reduce(
               (a, c) =>
-                a + (c.isHappyHour ? 0 : c.price) * c.quantity * (1 - c.discount) * (1 + c.taxRate),
+                a +
+                this.math.halfRoundEven(
+                  (c.isHappyHour ? 0 : c.price) * c.quantity * (1 - c.discount) * (1 + c.taxRate),
+                  2,
+                ),
               0,
             ) + t,
           0,