test: 更新单元测试

Author: ArgoZhang

test/UnitTest/Localization/JsonStringLocalizerTest.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 // Website: https://www.blazor.zone or https://argozhang.github.io/
 
-using BootstrapBlazor.Localization;
 using Microsoft.Extensions.Localization;
 using System.ComponentModel.DataAnnotations;
 using System.Reflection;

test/UnitTest/Utils/UtilityTest.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 // Website: https://www.blazor.zone or https://argozhang.github.io/
 
-using BootstrapBlazor.Localization.Json;
 using BootstrapBlazor.Server.Extensions;
 using Microsoft.Extensions.Localization;
 using Microsoft.Extensions.Options;

test/UnitTest/Validators/RequiredValidatorTest.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 // Website: https://www.blazor.zone or https://argozhang.github.io/
 
-using BootstrapBlazor.Localization.Json;
 using Microsoft.Extensions.Localization;
 using Microsoft.Extensions.Options;
 using System.ComponentModel.DataAnnotations;