fix(DB/Karazhan): remove Sha'tar rep gain from Restless Skeletons

[elthehablo]

Changes Proposed:

• remove onkill rep

Issues Addressed:

• Closes https://github.com/azerothcore/azerothcore-wotlk/issues/16270
• Closes https://github.com/chromiecraft/chromiecraft/issues/5607

SOURCE:

Tests Performed:

How to Test the Changes:

Known Issues and TODO List:

• [ ]
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