Organization settings: "Bots" tab view-only support.

This changes the layout of "organization settings" for
non-administrators such that they can view "Bots" ("Actions"
column is not made visible).

static/templates/settings/bot-list-admin.handlebars

@@ -6,7 +6,9 @@
     <th class="wrapped-cell">{{t "Name" }}</th>
     <th>{{t "Email" }}</th>
     <th>{{t "Owner" }}</th>
+    {{#if is_admin}}
         <th>{{t "Actions" }}</th>
+    {{/if}}
   </tbody>
 </table>
 <div id="admin_page_bots_loading_indicator"></div>

templates/zerver/settings_overlay.html

@@ -57,10 +57,12 @@
                     <i class="icon icon-vector-trash"></i>
                     <div class="text">{{ _('Deactivated users') }}</div>
                 </li>
+                {% endif %}
                 <li class="admin" tabindex="1" data-section="bot-list-admin">
                     <i class="icon icon-vector-github"></i>
                     <div class="text">{{ _('Bots') }}</div>
                 </li>
+                {% if is_admin %}
                 <li class="admin" tabindex="1" data-section="streams-list-admin">
                     <i class="icon icon-vector-exchange"></i>
                     <div class="text">{{ _('Delete streams') }}</div>