mdm navbar hamburger menu and menu open state icons correction

components/mobile-plugins/mobile-base-plugin/org.wso2.carbon.device.mgt.mobile.ui/src/main/resources/jaggeryapps/devicemgt/app/units/mdm.unit.ui.navbar.nav-menu/nav-menu.hbs

@@ -17,7 +17,7 @@
 }}
 {{#zone "navMenu-icon"}}
     <span class="icon fw-stack">
-        <i class="fw fw-tiles fw-stack-1x toggle-icon-up"></i>
+        <i class="fw fw-menu fw-stack-1x toggle-icon-down"></i>
     </span>
 {{/zone}}