Corrige spawn palmiers sur mud et corrige warning démarrage

saplings.lua

@@ -40,6 +40,7 @@ local sand_surfaces = {
 	["default:sand"] = true,
 	["default:desert_sand"] = true,
 	["cottages:loam"] = true,
+	["darkage:mud"] = true,
 	-- note, no silver sand here.
 	-- too cold for a palm, too... well... sandy for anything else.
 }