Use new names for grass textures in achievements. Fixes #1646

mods/lord/Game/lottachievements/init.lua

@@ -180,7 +180,7 @@ lottachievements.register_achievement("marksman_of_lorien", {
 lottachievements.register_achievement("merry_shire", {
 	title       = SL("Merry Shire"),
 	description = SL("Visit Shire and get his soil"),
-	icon        = "default_dirt.png^lottmapgen_shire_grass_side.png",
+	icon        = "default_dirt.png^lord_ground_dirt_shire_side.png",
 	id          = 11,
 	trigger     = {
 		type   = "dig",
@@ -192,7 +192,7 @@ lottachievements.register_achievement("merry_shire", {
 lottachievements.register_achievement("the_golden_lorien", {
 	title       = SL("The Golden Lorien"),
 	description = SL("Visit the forests of Lorien and get their soil"),
-	icon        = "default_dirt.png^lottmapgen_lorien_grass_side.png",
+	icon        = "default_dirt.png^lord_ground_dirt_lorien_side.png",
 	id          = 12,
 	trigger     = {
 		type   = "dig",
@@ -204,7 +204,7 @@ lottachievements.register_achievement("the_golden_lorien", {
 lottachievements.register_achievement("damaged_greenwood", {
 	title       = SL("Damaged Greenwood"),
 	description = SL("Visit the forests of Liholsye and get their soil"),
-	icon        = "default_dirt.png^lottmapgen_mirkwood_grass_side.png",
+	icon        = "default_dirt.png^lord_ground_dirt_mirkwood_side.png",
 	id          = 13,
 	trigger     = {
 		type   = "dig",
@@ -216,7 +216,7 @@ lottachievements.register_achievement("damaged_greenwood", {
 lottachievements.register_achievement("iron_hills", {
 	title       = SL("Iron Hills"),
 	description = SL("Visit the Iron Hills and get his soil"),
-	icon        = "default_dirt.png^lottmapgen_dunland_grass_side.png",
+	icon        = "default_dirt.png^lord_ground_dirt_dunland_side.png",
 	id          = 14,
 	trigger     = {
 		type   = "dig",
@@ -240,7 +240,7 @@ lottachievements.register_achievement("frozen_angmar", {
 lottachievements.register_achievement("lands_of_rohan", {
 	title       = SL("Lands of Rohan"),
 	description = SL("Visit Rohan and get his soil"),
-	icon        = "default_dirt.png^lottmapgen_rohan_grass_side.png",
+	icon        = "default_dirt.png^lord_ground_dirt_rohan_side.png",
 	id          = 16,
 	trigger     = {
 		type   = "dig",
@@ -276,7 +276,7 @@ lottachievements.register_achievement("live_fangorn", {
 lottachievements.register_achievement("anxious_dunland", {
 	title       = SL("Anxious Dunland"),
 	description = SL("Visit Dunland and get its soil"),
-	icon        = "default_dirt.png^lottmapgen_dunland_grass_side.png",
+	icon        = "default_dirt.png^lord_ground_dirt_dunland_side.png",
 	id          = 19,
 	trigger     = {
 		type   = "dig",