Abilities: Revert an unintentional change of the behavior of affect_a…

…llies.

Fixes #4257

src/units/abilities.cpp

@@ -131,11 +131,12 @@ bool affects_side(const config& cfg, std::size_t side, std::size_t other_side)
 	// display::get_singleton() has already been confirmed valid by both callers.
 	const team& side_team = display::get_singleton()->get_disp_context().get_team(side);
 
-	if(side == other_side || !side_team.is_enemy(other_side)) {
+	if(side == other_side)
 		return cfg["affect_allies"].to_bool(true);
-	} else {
+	if(side_team.is_enemy(other_side))
 		return cfg["affect_enemies"].to_bool();
-	}
+	else
+		return cfg["affect_allies"].to_bool();
 }
 
 }