[1.7.4] [Forbidden Cults] 2 artifacts with typo'd power sources

[ScienceBall]

The SPACE_DWARF_TRINKET (Bizzare Contraption) and the FANGED_COLLAR_HEAD have their power sources listed as

Code: Select all

power_source = {unkown=true}

That "unkown" should be "unknown".

[nsrr]

Fix submitted.