One-way doors don't work

Place soul sand in front of a two-block high doorway, and try to walk through. You will be able to do so.

This change was probably made to address MC-62170, which prevented people from walking through doorways with carpets in them. However, it also removed one-way doors, which have been around pretty much forever, have been used in numerous contraptions, and have been marked as "works as intended" multiple time on this bug tracker.