In https://github.com/discourse/discourse/pull/30242, the topic footer buttons mobile dropdown can be replaced by the button if there's only one option.
This fixes the spec that was clicking on the dropdown button before checking there was no assign option.
Dependent on https://github.com/discourse/discourse/pull/30132 getting
merged.
The UI for the "hidden" topic footer buttons on mobile changes from
SelectKit to DMenu, so the specs needed to be updated as such.
Sérgio Saquetim
Régis Hanol
Jarek Radosz