Fix is_ground_content settings for nodes

Remove line if set to the default of 'true'

init.lua

@@ -215,6 +215,7 @@ end
 minetest.register_node("tnt:tnt", {
 	description = "TNT",
 	tiles = {"tnt_top.png", "tnt_bottom.png", "tnt_side.png"},
+	is_ground_content = false,
 	groups = {dig_immediate=2, mesecon=2},
 	sounds = default.node_sound_wood_defaults(),
 	on_punch = function(pos, node, puncher)
@@ -268,6 +269,7 @@ minetest.register_node("tnt:gunpowder", {
 	description = "Gun Powder",
 	drawtype = "raillike",
 	paramtype = "light",
+	is_ground_content = false,
 	sunlight_propagates = true,
 	walkable = false,
 	tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},