Ensure escape door is open if there's a wipe

Door is already open by default, so no point in opening it again. Just make it open in case of failure...

TODO: make door close during waves. NOTE can't be done if IN_PROGRESS, else door close before players can get through it...
Remove unnecessary brackets

thx @balacas, forgot about cleaning them when editing...
Merge pull request #31 from Nyeriah/patch-7

Ensure escape door is open if there's a wipe