fix(SelectObject): remove IsRequired override method

Author: ArgoZhang

src/BootstrapBlazor/Components/Select/SelectObject.razor.cs

@@ -180,12 +180,6 @@ protected override void OnParametersSet()
         ClearIcon ??= IconTheme.GetIconByKey(ComponentIcons.SelectClearIcon);
     }
 
-    /// <summary>
-    /// <inheritdoc/>
-    /// </summary>
-    /// <returns></returns>
-    protected override bool IsRequired() => ValidateForm != null;
-
     private bool GetClearable() => IsClearable && !IsDisabled;
 
     /// <summary>

src/BootstrapBlazor/Components/Select/SelectTable.razor.cs

@@ -265,12 +265,6 @@ protected override void OnParametersSet()
         ClearIcon ??= IconTheme.GetIconByKey(ComponentIcons.SelectClearIcon);
     }
 
-    /// <summary>
-    /// <inheritdoc/>
-    /// </summary>
-    /// <returns></returns>
-    protected override bool IsRequired() => ValidateForm != null;
-
     /// <summary>
     /// 获得 Text 显示文字
     /// </summary>