[0.17.30] undo doesnt unmark trees for deconstruction

[joshinils]

after shift-placing a ghost of an assembler over a tree (at the same time marking that tree for deconstruction) then undoing that placement, the tree is still marked for deconstruction.

[Rseding91]

Thanks for the report however I don't consider this worth working on. There are a *lot* of different scenarios where this kind of stuff can happen and to make the game fully handle all of them is not worth the time and added complexity.

[joshinils]

sure, i'll continue to report any- and everything i deem a bug

[Rseding91]

sure, i'll continue to report any- and everything i deem a bug

And I'll move them to not-a-bug if they aren't bugs