Delphi: updateIcon property should replace `MAINICON` resource

[evgeny-k]

nowadays UnmanagedResourceFile.ReplaceIcons method ignores icon names and creates them as

  for i: System.Int32 := 0 to res.Length -1 do
    Add(new UnmanagedResourceElement(ResourceType := RT_ICON, Name := #0+(i+1).ToString, Data := res[i].Data));