Arcane Cascade stance does not correctly apply the ActiveEffectLike damage type flag

[mmechtley]

The actor activating the stance will have the pf2e.arcaneCascade.damageType flag but its value will be 0 instead of the correct damageType. This may be related to the Priority of the ChoiceSet vs. ActiveEffectLike rules but not sure.

Other abilities that attempt key off this flag (like Student of the Staff) will fail to work correctly.

Steps to reproduce:
Begin a combat
Have a character activate Arcane Cascade stance
Inspect the character's flags and note that arcaneCascade.damageType is 0 instead of the correct damage type