navbar: Change the user list menu (narrow) to user-list.svg.

Fixes: zulip#28756
In this commit, we are changing the user list menu icon(narrow screen) from triple-users to user-list.

docs/THIRDPARTY

@@ -242,6 +242,11 @@ Copyright: 2013-2023 Cole Bemis (https://feathericons.com)
 License: Expat
 Comment: Custom made out of feather icons by Vlad Koborov
 
+Files: web/shared/icons/user-list.svg
+Copyright: 2013-2023 Cole Bemis (https://feathericons.com)
+License: Expat
+Comment: Custom made out of feather icons by Vlad Koborov
+
 Files: web/shared/icons/unmute.svg
 Source: https://fonts.google.com/icons?selected=Material+Symbols+Rounded:volume_up
 Copyright: Google, Inc.

web/styles/zulip.css

@@ -2848,7 +2848,7 @@ select.invite-as {
     }
 
     .zulip-icon-help-bigger,
-    .zulip-icon-triple-users {
+    .zulip-icon-user-list {
         font-size: 20px;
     }
 

web/templates/navbar.hbs

@@ -39,7 +39,7 @@
             </div>
             <div id="userlist-toggle" class="hidden-for-spectators">
                 <a id="userlist-toggle-button" role="button" class="header-button" tabindex="0">
-                    <i class="zulip-icon zulip-icon-triple-users"></i>
+                    <i class="zulip-icon zulip-icon-user-list"></i>
                 </a>
             </div>
             <div id="help-menu">