Fixes broadside cannon direction recognition (#2695)

nsv13/code/__HELPERS/misc.dm

@@ -14,7 +14,8 @@
 
 ///Whether the angle is on the port or starboard side of the ship (facing north or south on the map)
 /proc/angle2dir_ship(angle)
-	if(0 < angle && angle < 180)
+	var/modulated_angle = (((angle % 360) + 360) % 360)
+	if(modulated_angle <= 180)
 		return SOUTH
 	else
 		return NORTH