Fix and simplify "challenge type" for ITS
Fix and simplify "challenge type" for ITS

This fixes the FVEggGame (gamete selection) so that it is of type "Sim"
instead of "Hatchery", but also makes the logic more straight-forward.

[#159735419]
concord-consortium/geniblocks,concord-consortium/geniblocks,concord-consortium/geniblocks