fixing some trees

A couple of trees have a footprint that is too big. It looks like you should be able to drive by them, but you can't. They have been set overly-large.
fixing tree cluster

This tree cluster looks like it should be passable through in this cell. Looks fine in testing, even though looked like it might be wrong in map editor.
Merge pull request #5258 from psydev/patch-4

fixing some trees