Fix texture pack sorting in content tab (minetest#12727)

Co-authored-by: SmallJoker <[email protected]>

builtin/mainmenu/pkgmgr.lua

@@ -177,7 +177,7 @@ function pkgmgr.get_texture_packs()
  end
 
  table.sort(retval, function(a, b)
- return a.name > b.name
+ return a.title:lower() < b.title:lower()
  end)
 
  return retval
@@ -787,6 +787,9 @@ end
 --------------------------------------------------------------------------------
 function pkgmgr.update_gamelist()
  pkgmgr.games = core.get_games()
+ table.sort(pkgmgr.games, function(a, b)
+ return a.title:lower() < b.title:lower()
+ end)
 end
 
 --------------------------------------------------------------------------------