[DEATH KNIGHT] AMS costs 20 runic power

[Shragenator]

The bug
Death knight spell Anti-Magic Shell costs 20 runic power instead of zero

To Reproduce

1. Select Unholy Death knight
2. Add Anti-Magic shell cast to the APL
3. Go to results > timeline and find the cast of AMS
4. Mouseover the timestamp for runic power at the top and notice the cost from casting AMS

Expected behavior
It should cost nothing as is always the case in Cataclysm

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• Simulations ran on browser version, Firefox Version 128.0.2 (64-bit)

[Shragenator]

@rosenrusinov i'm looking to start contributing! Could i field this one since it should be be easy? you can let me know if you'd like any assistance with the Death Strike heal behavior