Fixes unpowered doors being ignored by AStar

Fixes avoid turf functionality
Makes mulebots only recalculate paths due to blockades only once per life tick.

code/modules/mob/living/simple_animal/bot/mulebot.dm

@@ -515,7 +515,6 @@ mob/living/simple_animal/bot/mulebot/bot_reset()
 	if(refresh) update_controls()
 
 /mob/living/simple_animal/bot/mulebot/proc/process_bot()
-
 	if(!on)
 		return
 
@@ -582,13 +581,13 @@ mob/living/simple_animal/bot/mulebot/bot_reset()
 						if(blockcount > 10)	// attempt 10 times before recomputing
 							// find new path excluding blocked turf
 							buzz(SIGH)
-
-							spawn(2)
-								calc_path(next)
+							mode = BOT_WAIT_FOR_NAV
+							blockcount = 0
+							spawn(20)
+								calc_path(avoid=next)
 								if(path.len > 0)
 									buzz(DELIGHT)
 								mode = BOT_BLOCKED
-							mode = BOT_WAIT_FOR_NAV
 							return
 						return
 				else
@@ -622,7 +621,6 @@ mob/living/simple_animal/bot/mulebot/bot_reset()
 /mob/living/simple_animal/bot/mulebot/calc_path(turf/avoid = null)
 	path = get_path_to(loc, target, src, /turf/proc/Distance_cardinal, 0, 250, id=access_card, exclude=avoid)
 
-
 // sets the current destination
 // signals all beacons matching the delivery code
 // beacons will return a signal giving their locations