Small update to improve autotile

Hello!

This is just an update to fix a minor issue with the autotile! So I changed the following files: 

1. 'cemetery - wall1-platform_rule.tmx'
2. 'cemetery - wall2-platform_rule.tmx'
3. 'tileset-wall1'
4. 'tileset-wall2'

As always, thank you for your support!