Fix error endlessly appending to spellUpgrades table #11
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Fixes an error where ScanUpdates fails to copy the class common spell table and instead endlessly appends to it.
Addresses AdiAddons/AdiButtonAuras#388
Not the complete fix, because in Torghast SPELLS_CHANGED can fire 2 times per second making in not a good event for detecting actual changes to the spellbook. But it does make the problem not get linearly worse over time.