Minor Vehicle Refactor and Balance

code/modules/mining/lavaland/loot/tendril_loot.dm

@@ -163,7 +163,7 @@
 	desc = "A boat used for traversing lava."
 	icon_state = "goliath_boat"
 	icon = 'icons/obj/lavaland/dragonboat.dmi'
-	keytype = /obj/item/oar
+	held_key_type = /obj/item/oar
 	burn_state = LAVA_PROOF
 
 /obj/vehicle/lavaboat/relaymove(mob/user, direction)
@@ -174,7 +174,7 @@
 		..()
 	else
 		to_chat(user, "<span class='warning'>Boats don't go on land!</span>")
-		return 0
+		return FALSE
 
 /obj/item/oar
 	name = "oar"
@@ -218,7 +218,7 @@
 /obj/vehicle/lavaboat/dragon
 	name = "mysterious boat"
 	desc = "This boat moves where you will it, without the need for an oar."
-	keytype = null
+	held_key_type = null
 	icon_state = "dragon_boat"
 	generic_pixel_y = 2
 	generic_pixel_x = 1