Extinguish fire without nearby “fuel” faster

This patch adjusts how often the ABM runs that removes fire nodes with
no adjacent nodes that can burn up. This makes fire linger less in air.

mods/ITEMS/mcl_fire/init.lua

@@ -422,8 +422,8 @@ else -- Fire enabled
 	minetest.register_abm({
 		label = "Remove fires",
 		nodenames = {"mcl_fire:fire"},
-		interval = 12,
-		chance = 4,
+		interval = 7,
+		chance = 3,
 		catch_up = false,
 		action = function(pos)
 			local p=has_flammable(pos)