Fix endpoint for emulator

Author: yash2710

Microsoft.Azure.Cosmos/tests/Microsoft.Azure.Cosmos.EmulatorTests/CFP/AllVersionsAndDeletes/BuilderWithCustomSerializerTests.cs

@@ -697,7 +697,7 @@ private async Task WhenADocumentIsCreatedThenUpdatedThenDeletedTestsAsync(bool p
 
             CosmosClient cosmosClient = isMultiMaster 
                         ? new CosmosClient(accountEndpoint, options) 
-                        : new CosmosClient(accountEndpoint, authKey, options);
+                        : new CosmosClient(defaultEndpoint, authKey, options);
 
             Database database = await cosmosClient.CreateDatabaseIfNotExistsAsync(id: Guid.NewGuid().ToString());
             Container leaseContainer = await database.CreateContainerIfNotExistsAsync(containerProperties: new ContainerProperties(id: "leases", partitionKeyPath: "/id"));