Lurker FAI: map(x, self) is exactly the same as just self

This caused the crash fixed in the previous commit. Although the crash is fixed, it's still stupid and we shouldn't do it.

data/ai/micro_ais/engines/lurker_moves.fai

@@ -24,7 +24,7 @@ def reachable_enemies_next_to_swamp(unit_loc,attacks,map)
     # Returns all the attacks for enemies that the unit at 'unit_loc' #
     # can reach and that are next to a swamp hex #
     filter(
-        map( attacks.attacks, self),
+        attacks.attacks,
         (move_from = unit_loc) and (is_swamp( map, attack_from.x, attack_from.y))
     );