Header nav menu responsiveness improvements

components/device-mgt/org.wso2.carbon.device.mgt.ui/src/main/resources/jaggeryapps/devicemgt/app/units/cdmf.unit.ui.header.user-menu/user-menu.hbs

@@ -31,12 +31,8 @@
                     {{/if}}
                 </span>
             </a>
-            <ul class="dropdown-menu dropdown-menu-right float-remove-xs position-static-xs text-center-xs remove-margin-xs slideInDown"
+            <ul class="dropdown-menu dropdown-menu-right slideInDown"
                 role="menu">
-                <li class="dropdown-header visible-xs">
-                    {{@user.username}}<span class="caret"></span>
-                </li>
-                <li class="divider visible-xs"></li>
                 <li>
                     <a href="javascript:void(0)" id="change-password">Change password</a>
                 </li>