aco: Fix uniform boolean transform

This series contains a few fixes to the uniform boolean transformation:

• The first commit is a fix needed for correctness. For example, Dead or Alive 6 crashes without it, so it has a Fixes tag for being backported to 20.0 as well.
• The other commit is a small improvement that prevents RA from adding superfluous moves in certain cases. This is not intended for the 20.0 release. Removed from this series.

Our pipeline db is not affected by this change (otherwise I would have noticed the crash that it fixes sooner).