Makes the heretic worm use the blood walk element (#65658)

* Makes the heretic worm use the blood walk element
It was using a custom proc for this, but we have an element just for
this.

* Update code/modules/mob/living/simple_animal/heretic_monsters.dm

Co-authored-by: John Willard <53777086+JohnFulpWillard@users.noreply.github.com>

* dont need this'

* adds an extra arg the to the element to keep direction

* moves da eement

Co-authored-by: John Willard <53777086+JohnFulpWillard@users.noreply.github.com>

code/datums/elements/blood_walk.dm

@@ -11,6 +11,8 @@
 	var/sound_volume
 	///The chance of spawning blood whenever walking
 	var/blood_spawn_chance
+	///Should the decal face the direction of the target
+	var/target_dir_change
 
 
 /datum/element/blood_walk/Attach(
@@ -19,6 +21,7 @@
 	sound_played,
 	sound_volume = 80,
 	blood_spawn_chance = 100,
+	target_dir_change = FALSE
 )
 	. = ..()
 	if(!ismovable(target))
@@ -28,6 +31,7 @@
 	src.sound_played = sound_played
 	src.sound_volume = sound_volume
 	src.blood_spawn_chance = blood_spawn_chance
+	src.target_dir_change = target_dir_change
 	RegisterSignal(target, COMSIG_MOVABLE_MOVED, .proc/spread_blood)
 
 /datum/element/blood_walk/Detach(datum/target)
@@ -45,6 +49,8 @@
 	if(!prob(blood_spawn_chance))
 		return
 
-	new blood_type(current_turf)
+	var/obj/effect/decal/blood = new blood_type(current_turf)
+	if (target_dir_change)
+		blood.setDir(movable_source.dir)
 	if(!isnull(sound_played))
 		playsound(movable_source, sound_played, sound_volume, TRUE, 2, TRUE)