fix: appname for mobile screen (#3715)

Author: himanshu010

app/templates/components/nav-bar.hbs

@@ -48,7 +48,7 @@
       <i class="large content icon"></i>
     </a>
     {{#link-to 'index' class='item' activeClass=''}}
-      <div class="ui header small text">{{config.appName}}</div>
+      <div class="ui header small text">{{settings.appName}}</div>
     {{/link-to}}
     <div class="right menu nav-bar">
       {{#if session.isAuthenticated}}