Fix sidebar spec

spec/features/boards/sidebar_spec.rb

@@ -115,7 +115,6 @@ describe 'Issue Boards', feature: true, js: true do
           click_link 'Unassigned'
         end
 
-        find('.dropdown-menu-toggle').click
         wait_for_vue_resource
 
         expect(page).to have_content('No assignee')