Increase spawn rate for solo and non full team premades

[Samhel]

As a solo player (not just a little portion of the community again DE thank you), i can say that sometimes the decreased rate of enemy spawning in survival, defense, disruptions while playing int solo or duo is just somewhat ruins things, like managing life support and it increases the time required to complete waves and to acquire keys, because the few enemies that spawn tend to lose their ability to walk out from their little spawnpoint to where the action takes place.