feat(#I18IU2): blazor 网站设置增加固定表头选项

#Issue
link https://gitee.com/LongbowEnterprise/dashboard/issues?id=I18IU2

src/admin/Bootstrap.Admin/Pages/Admin/Settings.razor

@@ -83,6 +83,10 @@
                         <label class="control-label" for="cardTitle">标题设置</label>
                         <Toggle @bind-Value="@Model.ShowCardTitle" OnText="显示" OffText="关闭"></Toggle>
                     </div>
+                    <div class="form-group col-6">
+                        <label class="control-label" for="cardTitle">固定表头</label>
+                        <Toggle @bind-Value="@Model.FixedTableHeader" OnText="固定" OffText="跟随"></Toggle>
+                    </div>
                 </div>
             </div>
             <div class="modal-footer text-right">