fix slime blood not transfusing to vampires (#31314)

* fix slime blood not transfusing to vampires

* fix non-vampire slime transfusion

* santa claus but it's a guard

code/modules/surgery/organs/blood.dm

@@ -365,11 +365,13 @@
 		O.off_floor = TRUE
 		O.layer = BELOW_MOB_LAYER
 
-/mob/living/proc/absorb_blood()
+/mob/living/proc/absorb_blood(passed_id)
 	// This merely deletes the blood reagent inside of the mob to look nice on health scans.
 	// The update to .blood_volume happens in `/datum/reagent/proc/reaction_mob`
 	var/id = get_blood_id()
+	if(passed_id)
+		id = passed_id
 	if(id)
-		reagents.del_reagent(get_blood_id())
+		reagents.del_reagent(id)
 
 #undef EXOTIC_BLEED_MULTIPLIER