Flip pip AI to eat least grown arbor tree branch instead of most grown

[JDL]

Current pip AI for eating from arbor trees will select the most grown arbor tree branch on the tree.

This causes the issue where a 100% grown branch creates a harvest job for a dupe, becomes eaten below 100%, and then gets harvested, returning no resources.

Instead of this current behavior, I'd suggest flipping the pip AI to select the least grown valid branch on a tree.

This lets arbor trees within a pip ranch return excess input resources as lumber at a far more reliable rate, as fewer to no failed harvesting jobs would occur.