Fix mainmenu game initialisation

builtin/mainmenu/init.lua

@@ -84,6 +84,11 @@ local function init_globals()
 	menudata.worldlist:add_sort_mechanism("alphabetic",sort_worlds_alphabetic)
 	menudata.worldlist:set_sortmode("alphabetic")
 
+	if not core.setting_get("menu_last_game") then
+		local default_game = core.setting_get("default_game") or "minetest"
+		core.setting_set("menu_last_game", default_game )
+	end
+
 	mm_texture.init()
 
 	--create main tabview