Fix ACF2 mission sometimes being unwinnable after returning to Leaks A Lot
After accepting cyborgs offer, combat should normally start after walking past
the tree. This sometimes didn't work, the mission did not advance and you
could never win, even after defeating the Stronglings.
07f3bf8d98a3
Hedgewars.png had a resolution more than twice as high as required; also fixed some (mostly obsolete) code that also contained a typo that would cause a warning/note in clang
