removed unused code

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/GlobalFilterDefinition.cs

@@ -1,7 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Threading.Tasks;
 using JetBrains.Annotations;
 using Volo.Abp.Localization;
 

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Dashboards/Volo/Abp/AspNetCore/Mvc/UI/Dashboards/IDashboardRenderer.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Microsoft.AspNetCore.Html;
 using Microsoft.AspNetCore.Mvc;
 using Volo.Abp.DependencyInjection;

framework/src/Volo.Abp.AspNetCore.Mvc.UI.Widgets/Volo/Abp/AspNetCore/Mvc/UI/Widgets/AbpAspNetCoreMvcUiWidgetsModule.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Mvc.ViewComponents;
 using Microsoft.Extensions.DependencyInjection;
 using Volo.Abp.AspNetCore.Mvc.UI.Bootstrap;