Fix Blocks repeated in tp preview, Fixes LEGACY-4
- Adjusted position of "Done" button in Preview screen.
- Changed name of "Done" button in Preview screen to "Go Back"
- Removed buttons for Texture Pack Database and More Info on Texture Pack
  selection screen.
- Some Texture Pack Database code was removed.
Signed-off-by: Steven Downer <grinch@outlook.com>