Is ground content (#13)

* protect2 isn't ground content

* protect_hidden isn't ground content

* unrelated luacheck fix

admin.lua

@@ -159,6 +159,7 @@ minetest.register_node("protector:protect_hidden", {
 	floodable = false,
 	drop = "",
 	groups = {not_in_creative_inventory = 1, unbreakable = 1},
+	is_ground_content = false,
 	on_blast = function() end,
 	-- 1px block inside door hinge near node top
 	collision_box = {

doors_chest.lua

@@ -27,7 +27,7 @@ function register_door(name, def)
 		inventory_image = def.inventory_image,
 
 		on_place = function(itemstack, placer, pointed_thing)
-			if not pointed_thing.type == "node" then
+			if pointed_thing.type ~= "node" then
 				return itemstack
 			end
 
@@ -128,7 +128,7 @@ function register_door(name, def)
 		end
 
 		pos.y = pos.y + dir
-		if not minetest.get_node(pos).name == check_name then
+		if minetest.get_node(pos).name ~= check_name then
 			return false
 		end
 		if minetest.is_protected(pos, user:get_player_name()) then

init.lua

@@ -509,6 +509,7 @@ minetest.register_node("protector:protect2", {
 	inventory_image = "protector_logo.png",
 	sounds = default.node_sound_stone_defaults(),
 	groups = {dig_immediate = 2, unbreakable = 1},
+	is_ground_content = false,
 	paramtype = "light",
 	paramtype2 = "wallmounted",
 	legacy_wallmounted = true,