Revert imort changes to load balancer prose test

Author: prestonvasquez

mongo/integration/load_balancer_prose_test.go

@@ -16,8 +16,6 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.mongodb.org/mongo-driver/bson"
-	"go.mongodb.org/mongo-driver/internal/assert"
-	"go.mongodb.org/mongo-driver/internal/require"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/integration/mtest"
 	"go.mongodb.org/mongo-driver/mongo/options"