Fix grass _5 inventory images and drop the ones from grass _1-4

Grass _1-4 : if they're not in the creative_inventory and they always drop the grass _5 on digging -> no need to have an inventory/wield image.

Author: kilbith

mods/default/nodes/grass.lua

@@ -43,6 +43,7 @@ minetest.register_node("default:grass_5", {
 	drawtype = "plantlike",
 	waving = 1,
 	tiles = {"default_grass_5.png"},
+	inventory_image = "default_grass_3.png",
 	--wield_image = "default_grass_3.png",
 	paramtype = "light",
 	sunlight_propagates = true,
@@ -69,6 +70,7 @@ minetest.register_node("default:dry_grass_5", {
 	drawtype = "plantlike",
 	waving = 1,
 	tiles = {"default_dry_grass_5.png"},
+	inventory_image = "default_dry_grass_3.png",
 	--wield_image = "default_dry_grass_3.png",
 	paramtype = "light",
 	sunlight_propagates = true,
@@ -96,8 +98,6 @@ for i = 1, 4 do
 		drawtype = "plantlike",
 		waving = 1,
 		tiles = {"default_grass_" .. i .. ".png"},
-		inventory_image = "default_grass_" .. i .. ".png",
-		wield_image = "default_grass_" .. i .. ".png",
 		paramtype = "light",
 		sunlight_propagates = true,
 		walkable = false,
@@ -117,8 +117,6 @@ for i = 1, 4 do
 		drawtype = "plantlike",
 		waving = 1,
 		tiles = {"default_dry_grass_" .. i .. ".png"},
-		inventory_image = "default_dry_grass_" .. i .. ".png",
-		wield_image = "default_dry_grass_" .. i .. ".png",
 		paramtype = "light",
 		sunlight_propagates = true,
 		walkable = false,