!786 fix(#I2A3Q1): set original tab item active to false in Tab.Add method

* fix: 修复 Tab Add 方法

src/BootstrapBlazor/Components/Tab/Tab.razor.cs

@@ -396,6 +396,7 @@ namespace BootstrapBlazor.Components
         public void Add(Dictionary<string, object> parameters)
         {
             var item = TabItem.Create(parameters);
+            if (item.IsActive) _items.ForEach(i => i.SetActive(false));
             _items.Add(item);
             StateHasChanged();
         }