Fix memory leak in MuPatHitTool

Walter Lamplrequested to merge
wlampl/athena:MuPatLeakWork into master

Fixes ATLASRECTS-5715 by passing the cleanUp calls though the lenghty call-chain to MuPatHitTool. Valgrind confirms that the leak is fixed.

Adresses also ATLASRECTS-5330.

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