Move spell cost calculation up slightly to account for spell cost ternaries

[Standing-Storm]

Summary

Infrastructure "Move spell cost calculation up slightly to account for spell cost ternaries"

Purpose of change

Ternaries in spell costs were working the opposite of the way the interface indicated they should work.

Describe the solution

Based on suggestion from andrei8l, move the spell cost deduction to before spell effects are applied.

Fixes #69751

Describe alternatives you've considered

Testing

Cast Karma Arms--it now costs 200 to apply and 0 to remove.
Cast Speak Through the Aether (cost 450 mana), spell cost properly deducted.
Cast Taze (cost 30 bionic power), spell cost properly deducted.
Channel Fountain of Flames (cost : of Stamina bar), power cost properly deducted.
Cast Spear of Brambles (cost 450 mana, components required), spell cost properly deducted, components consumed.
Cast Debug HP Spell (Cost | of HP bar), spell cost properly deducted.

All spells produced the appropriate effects (except for Debug HP spell, I got an error about a missing effect, but the cost worked)

Additional context