Fix spec not waiting for redirect

Accepting the confirm dialog triggers a redirect
We either need a wait_for_requests, or to assert we're not on the
group page anymore

spec/features/groups/members/leave_group_spec.rb

@@ -31,6 +31,7 @@ describe 'Groups > Members > Leave group' do
 
     page.accept_confirm
 
+    wait_for_all_requests
     expect(current_path).to eq(dashboard_groups_path)
     expect(group.users).not_to include(user)
   end