Replaces random() with prob() in lavaland elite code (tgstation#72816)

## About The Pull Request

Replaces random() proc with prob() in herald and goliath broodmother
code

## Why It's Good For The Game

Using prob() proc tooks less space and also it is more readable

## Changelog
:cl:
code: Replaced some random() procs in lavaland elite code with prob()
procs
/:cl:

code/modules/mob/living/simple_animal/hostile/mining_mobs/elites/goliath_broodmother.dm

@@ -247,7 +247,7 @@
 	return "mark detonation to have a <b>[bonus_value]%</b> chance to summon a patch of goliath tentacles at the target's location"
 
 /obj/item/crusher_trophy/broodmother_tongue/on_mark_detonation(mob/living/target, mob/living/user)
-	if(rand(1, 100) <= bonus_value && target.stat != DEAD)
+	if(prob(bonus_value) && target.stat != DEAD)
 		new /obj/effect/temp_visual/goliath_tentacle/broodmother/patch(get_turf(target), user)
 
 /obj/item/crusher_trophy/broodmother_tongue/attack_self(mob/user)

code/modules/mob/living/simple_animal/hostile/mining_mobs/elites/herald.dm

@@ -270,7 +270,7 @@
 
 /obj/item/clothing/neck/cloak/herald_cloak/hit_reaction(mob/living/carbon/human/owner, atom/movable/hitby, attack_text = "the attack", final_block_chance = 0, damage = 0, attack_type = MELEE_ATTACK)
 	. = ..()
-	if(rand(1,100) > hit_reaction_chance)
+	if(prob(hit_reaction_chance))
 		return
 	owner.visible_message(span_danger("[owner]'s [src] emits a loud noise as [owner] is struck!"))
 	var/static/list/directional_shot_angles = list(0, 45, 90, 135, 180, 225, 270, 315)