fix(customcurrencies): address review feedback

Author: turip

openmeter/billing/charges/models/costbasis/resolver.go

@@ -6,9 +6,10 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/samber/lo"
+
 	"github.com/openmeterio/openmeter/openmeter/currencies"
 	"github.com/openmeterio/openmeter/pkg/models"
-	"github.com/samber/lo"
 )
 
 type Resolver interface {

openmeter/billing/charges/service/usagebased_costbasis_test.go

@@ -281,6 +281,7 @@ func (s *UsageBasedCostBasisCreateSuite) TestDynamicCostBasisResolvesWhenChargeB
 	})
 	s.setCustomCurrencyEnabled(true)
 	clock.FreezeTime(activationAt)
+	defer clock.UnFreeze()
 	created, err := s.Charges.usageBasedService.Create(ctx, usagebased.CreateInput{
 		Namespace: namespace,
 		Intents: []usagebased.Intent{