Fix SPELL_DAMAGE_CLASS_NONE unable to crit

Corrected logic mistake where switch fallthrough was intended (or should have been).
Fixes the following.
// Earth Shield
// Lifebloom Final Bloom
// Divine Hymn
// Item - Bauble of True Blood 10m
// Item - Bauble of True Blood 25m
Merge pull request #11857 from Unholychick/master

Core/Spells: Fix SPELL_DAMAGE_CLASS_NONE unable to crit