DB/Spells: added missing internal proc cooldown for Chill of the Grave to avoid additional granting runic power when hitting multiple targets with a single attack

sql/updates/world/4.3.4/2020_08_28_02_world.sql

@@ -0,0 +1 @@
+UPDATE `spell_proc` SET `Cooldown`= 500 WHERE `SpellId`= -49149;