TNT particles: use drops list smartly

The drops list already has quantities, so let's just select the one
with the highest quantity from it, and use that as tile. Fallback
tile will therefore only be used if explosion happens in air. Oh well.

mods/tnt/init.lua

@@ -138,7 +138,7 @@ local function entity_physics(pos, radius)
 	end
 end
 
-local function add_effects(pos, radius)
+local function add_effects(pos, radius, drops)
 	minetest.add_particlespawner({
 		amount = 128,
 		time = 1,
@@ -158,14 +158,12 @@ local function add_effects(pos, radius)
 	-- we just dropped some items. Look at the items entities and pick
 	-- one of them to use as texture
 	local texture = "tnt_blast.png" --fallback texture
-	local objs = minetest.get_objects_inside_radius(pos, 2)
-	for _, obj in pairs(objs) do
-		if obj and obj:get_luaentity() then
-			local def = ItemStack(obj:get_luaentity().itemstring):get_definition()
-			if def.tiles then
-				texture = def.tiles[1]
-				break
-			end
+	local most = 0
+	for name, stack in pairs(drops) do
+		local count = stack:get_count()
+		if count > most then
+			most = count
+			texture = minetest.registered_nodes[name].tiles[1]
 		end
 	end
 
@@ -265,7 +263,7 @@ function tnt.boom(pos, def)
 	if not def.disable_drops then
 		eject_drops(drops, pos, def.radius)
 	end
-	add_effects(pos, def.radius)
+	add_effects(pos, def.radius, drops)
 end
 
 minetest.register_node("tnt:boom", {