Fixes Jungleland rocks being flammable (#22557)

* Update flora.dm

* Update flora.dm

Author: Moltijoe

code/game/objects/structures/flora.dm

@@ -375,7 +375,7 @@
 	icon_state = "basalt"
 	desc = "A volcanic rock. Pioneers used to ride these babies for miles."
 	icon = 'icons/obj/flora/rocks.dmi'
-	resistance_flags = parent_type::resistance_flags | UNACIDABLE
+	resistance_flags = parent_type::resistance_flags | FIRE_PROOF
 	density = TRUE
 	var/obj/item/stack/mineResult = /obj/item/stack/ore/glass/basalt