Rails5: fix flaky spec

changelogs/unreleased/rails5-fix-flaky-spec-user-uses-shortcuts.yml

+---
+title: 'Rails5: fix flaky spec'
+merge_request: 20953
+author: Jasper Maes
+type: fixed

spec/features/projects/user_uses_shortcuts_spec.rb

@@ -9,6 +9,8 @@ describe 'User uses shortcuts', :js do
     sign_in(user)
 
     visit(project_path(project))
+
+    wait_for_requests
   end
 
   context 'when navigating to the Project pages' do