refactor(#IVRNQ): 登录页面出错后提示信息

移除默认提示信息
#Issue
https://gitee.com/LongbowEnterprise/dashboard/issues?id=IVRNQ

#Comment
Link #IVRNQ

Bootstrap.Admin/Views/Account/Login.cshtml

@@ -45,15 +45,8 @@
     <input id="imgUrl" type="hidden" value="@Model.ImageLibUrl" />
     <form id="login" method="post" class="form-signin">
         <h2 class="form-signin-heading">@Model.Title</h2>
-        <div class="login-wrap" data-toggle="LgbValidate" data-valid-button="button[type='submit']">
-            @if (Model.AuthFailed)
-            {
-                <div class="alert alert-danger">用户名或密码错误！</div>
-            }
-            else
-            {
-                <div class="alert alert-success">请输入用户名与密码</div>
-            }
+        <div class="login-wrap" data-auth="@Model.AuthFailed" data-toggle="LgbValidate" data-valid-button="button[type='submit']">
+            <div class="alert alert-danger" asp-condition="@Model.AuthFailed">用户名或密码错误！</div>
             <div class="form-group">
                 <div class="input-group">
                     <div class="input-group-prepend">

Bootstrap.Admin/wwwroot/css/login-responsive.css

@@ -31,12 +31,12 @@
 
     .login-wrap {
         padding: 0;
-        margin: 12px 0 0 370px;
+        margin: 36px 0 0 370px;
         width: 280px;
     }
 
     .slidercaptcha {
-        top: -282px;
+        top: -254px;
         left: -15px;
     }
 
@@ -45,7 +45,20 @@
             height: 280px;
         }
 
-    .form-signin .form-group {
-        margin-bottom: 0.75rem;
+    .login-wrap[data-auth="True"] {
+        margin: 12px 0 0 370px;
     }
+
+        .login-wrap[data-auth="True"] .slidercaptcha {
+            top: -282px;
+        }
+
+        .login-wrap[data-auth="True"] .slidercaptcha, .slidercaptcha.forgot {
+            width: 310px;
+            height: 280px;
+        }
+
+        .login-wrap[data-auth="True"] .form-group {
+            margin-bottom: 0.75rem;
+        }
 }

Bootstrap.Admin/wwwroot/css/login.css

@@ -14,7 +14,7 @@
 
 .login-wrap {
     padding: 20px;
-    height: 330px;
+    height: 270px;
 }
 
     .login-wrap .rememberPwd {
@@ -27,6 +27,10 @@
             width: 13px;
         }
 
+    .login-wrap[data-auth="True"] {
+        height: 330px;
+    }
+
 .login-footer a:last-child {
     float: right;
 }