修改BUG：演示模式下禁止更改管理员显示名称 closed #IV93R

#Issue
https://gitee.com/LongbowEnterprise/dashboard/issues?id=IV93R

Bootstrap.Admin/Views/Admin/Profiles.cshtml

@@ -1,4 +1,4 @@
-@model ProfilesModel
+@model ProfilesModel
 @{
     ViewBag.Title = "个人中心";
 }
@@ -33,6 +33,9 @@
 <div class="card">
     <div class="card-header">基本资料</div>
     <div class="card-body" data-toggle="LgbValidate" data-valid-button="#btnSaveDisplayName">
+        <div class="alert alert-danger" role="alert" asp-condition="@Model.IsDemo">
+            <span>演示系统禁止更改管理员显示名称</span>
+        </div>
         <form class="form-inline">
             <div class="row">
                 <div class="form-group col-sm-6 col-md-auto">
@@ -45,7 +48,7 @@
                 </div>
             </div>
         </form>
-        <div class="modal-footer" asp-auth="saveDisplayName">
+        <div class="modal-footer" asp-auth="saveDisplayName" asp-condition="!@Model.IsDemo">
             <button id="btnSaveDisplayName" data-method="user" class="btn btn-secondary" type="button"><i class="fa fa-save"></i><span>保存</span></button>
         </div>
     </div>