Fix Banana Growers blocking the Sumo's door

[ryfactor]

@AquariusPower how about this? After sumo wrestling, it checks for all the banana growers on the level and sets their FeedingSumo flags to false, meaning they change their MovingTo target to the banana drop area during their GetAICommand().

The only thing is it requires static std::vector<character*> FindCharactersOnLevel() to become a public member of class bugfixdp. It's a pretty handy method, some of this stuff could really be generalized to the rest of the code. Could probably make it a method in level.cpp.

[AquariusPower]

I dont remember if the problem only happens after the sumo wrestling or before too.
I read the code and it looks good, but I couldnt test it yet as my environment here changed a lot, and I need to track down where everything is and also the backups :>
I see this is the same branch for the pull on the Attnam repo.
I will merge here so you can continue there.
Can i add you (and the others) here as maintainer? so that you can freely change things here to not block the pull requests on Attnam. I will check.