Remove icons from group settings dropdown

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/layouts/nav/_group_settings.html.haml

@@ -13,17 +13,14 @@
             - if ldap_enabled?
               = nav_link(controller: :ldap_group_links) do
                 = link_to group_ldap_group_links_path(@group), title: "LDAP Groups" do
-                  %i.fa.fa-exchange
                   %span
                     LDAP Groups
             = nav_link(controller: :hooks) do
               = link_to group_hooks_path(@group), title: "Webhooks" do
-                %i.fa.fa-link
                 %span
                   Webhooks
             = nav_link(controller: :audit_events) do
               = link_to group_audit_events_path(@group), title: "Audit Events" do
-                %i.fa.fa-file-text-o
                 %span
                   Audit Events
             %li.divider