Fix #5028 and allow random camo to go into deeper directories #5035
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The random camouflage picker was sometimes picking directories instead of files to use as camo for a group in a generated contract. It also wasn't going into all of the subdirectories, only the first level under the faction, so some files were getting left out. This fixes both of those problems.
It seems like Camoflauge or AbstractIcon should have some verification that the files you pass them exist, but...