fix(blood): Modifies remove_reagent calls to remove_blood calls

Fixes https://github.com/VOREStation/VOREStation/issues/14817

remove_reagent has no sanitization for making sure the person has at least 1 u of blood remaining, and is therefore unsafe to use.

This commit changes all human remove_reagent("blood", amt) calls with remove_blood(amt).

This should prevent blood disappearing from internal bleeding or dragging someone while they're down or from drawing blood from them and so forth.

Not all cases of remove_reagent("blood", amt) were changed, as some act on organs or other reagent containers not part of a human mob or because it's set_species

code/game/gamemodes/cult/construct_spells.dm

@@ -472,7 +472,7 @@
 		var/mob/living/carbon/human/H = owner
 		if(!H.should_have_organ(O_HEART))
 			return 1
-		if(H.vessel.remove_reagent("blood", amount))
+		if(H.remove_blood(amount))
 			return 1
 	return 0
 
@@ -673,4 +673,4 @@
 		else
 			user.visible_message("<b>\The [user]</b> lowers its fist.")
 			return
-	qdel(src)
+	qdel(src)