Endless Defense - No Opportunity To Clean Up After Last Wave

[tinyrodent]

Often there are one or more mods laying around at the end of the wave. I try to keep one enemy alive until they are all picked up, but not everyone does, and it's not always possible. So if we want to claim & exit, it means leaving behind any mods still on the floor. It would be nice to get an opportunity after claim - for example it could act like other missions where players have to walk to the extraction point.