Core/Spells: Arcane Missiles will now proc on spell cast instead of spell hit and may proc from triggered missiles

sql/updates/world/4.3.4/2020_10_22_01_world.sql

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+-- Allow Arcane Missiles to proc on cast instead of on hit
+UPDATE `spell_proc` SET `SpellPhaseMask`= 1 WHERE `SpellId`= 79684;