Fix group settings dropdown for group members and visitors

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

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

 - if current_user
-  .controls
-    %span.dropdown.group-settings-dropdown
-      %a.dropdown-new.btn.btn-gray#group-settings-button{href: '#', 'data-toggle' => 'dropdown'}
-        = icon('cog')
-        = icon('caret-down')
-      %ul.dropdown-menu.dropdown-menu-align-right
-        = nav_link(path: 'groups#projects') do
-          = link_to projects_group_path(@group), title: 'Projects' do
-            Projects
-        %li.divider
-        - if can?(current_user, :admin_group, @group)
-          %li
-            = link_to edit_group_path(@group) do
-              Edit Group
-        - if access = @group.users.find_by(id: current_user.id)
+  - if access = @group.users.find_by(id: current_user.id)
+    .controls
+      %span.dropdown.group-settings-dropdown
+        %a.dropdown-new.btn.btn-gray#group-settings-button{href: '#', 'data-toggle' => 'dropdown'}
+          = icon('cog')
+          = icon('caret-down')
+        %ul.dropdown-menu.dropdown-menu-align-right
+          - if can?(current_user, :admin_group, @group)
+            = nav_link(path: 'groups#projects') do
+              = link_to projects_group_path(@group), title: 'Projects' do
+                Projects
+            %li.divider
+            %li
+              = link_to edit_group_path(@group) do
+                Edit Group
           %li
             = link_to leave_group_group_members_path(@group),
               data: { confirm: leave_group_message(@group.name) }, method: :delete, title: 'Leave group' do