Fix fetish purging at the Church

khanfluencerequested to merge
khanfluence/mgd-ptce:fix-fetish-purge into master

Restore missing costPerFetish. Use value 5 as it seems intended per PtCE v1: https://github.com/saryakan/MGD-PtCE?tab=readme-ov-file#changed-cost-of-purging-temporary-fetishes.

Change purgeableFetishes to a list. len isn't callable on filter objects.

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