doc: 更新默认值

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/Selects.razor.cs

@@ -41,16 +41,11 @@ public sealed partial class Selects
     [NotNull]
     private IStringLocalizer<Foo>? LocalizerFoo { get; set; }
 
-    private bool _showSearch;
-
+    private bool _showSearch = true;
     private bool _showPopoverSearch = true;
-
-    private bool _isShowSearchClearable;
-
-    private bool _isFixedSearch;
-
-    private bool _isClearable;
-
+    private bool _isShowSearchClearable = true;
+    private bool _isFixedSearch = true;
+    private bool _isClearable = true;
     private string? _fooName;
 
     private readonly List<SelectedItem> _enumValueDemoItems = [