Fix minetest#4111 ("Provided world path doesn't exist" if choosing si…

…ngleplayer on first run")

Bug and whitespace error fixed (Zeno)

builtin/mainmenu/init.lua

@@ -77,13 +77,28 @@ local function init_globals()
 
  if PLATFORM == "Android" then
  local world_list = core.get_worlds()
- local world_index = table.indexof(world_list, "singleplayerworld")
+ local world_index
+
+ local found_singleplayerworld = false
+ for i, world in ipairs(world_list) do
+ if world.name == "singleplayerworld" then
+ found_singleplayerworld = true
+ world_index = i
+ break
+ end
+ end
 
- if world_index == -1 then
+ if not found_singleplayerworld then
  core.create_world("singleplayerworld", 1)
 
  world_list = core.get_worlds()
- world_index = table.indexof(world_list, "singleplayerworld")
+
+ for i, world in ipairs(world_list) do
+ if world.name == "singleplayerworld" then
+ world_index = i
+ break
+ end
+ end
  end
 
  gamedata.worldindex = world_index