Merge branch 'fix-issuable-filter' into 'master'

Hide "Create new list button" on Issues and MRs pages

![1](/uploads/d8b08cb62cfc9e9d29e3e64b2ed0a8af/1.png)

/cc @jschatz1 

See merge request !5852

app/views/shared/issuable/_filter.html.haml

@@ -27,9 +27,7 @@
           = render "shared/issuable/label_dropdown"
 
         .pull-right
-          - if controller.controller_name != 'boards'
-            = render 'shared/sort_dropdown'
-          - if can?(current_user, :admin_list, @project)
+          - if controller.controller_name == 'boards' && can?(current_user, :admin_list, @project)
             .dropdown
               %button.btn.btn-create.js-new-board-list{ type: "button", data: { toggle: "dropdown", labels: labels_filter_path, project_id: @project.try(:id) } }
                 Create new list
@@ -38,6 +36,8 @@
                 - if can?(current_user, :admin_label, @project)
                   = render partial: "shared/issuable/label_page_create"
                 = dropdown_loading
+          - else
+            = render 'shared/sort_dropdown'
 
     - if controller.controller_name == 'issues'
       .issues_bulk_update.hide