Adding error styles on el-tabs error

Themes/Adminlte/assets/css/asgard.css

@@ -116,3 +116,6 @@ footer.main-footer p.text-muted {
   right: 10px;
   border-radius: 2px;
 }
+.el-tabs__header .error {
+  color: #dd4b39;
+}

Themes/Adminlte/resources/assets/less/asgard.less

@@ -58,3 +58,9 @@
   right: 10px;
   border-radius: 2px;
 }
+
+.el-tabs__header {
+  .error {
+    color : #dd4b39;
+  }
+}

public/themes/adminlte/css/asgard.css

@@ -116,3 +116,6 @@ footer.main-footer p.text-muted {
   right: 10px;
   border-radius: 2px;
 }
+.el-tabs__header .error {
+  color: #dd4b39;
+}