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Reduce maxIterations of iPatFitter for track cleaning in the trigger

Savanna Shaw requested to merge sshaw/athena:trigmu-trackclean into master

As part of the CPU optimisation for the muon triggers (ATR-18811), reducing the maxIterations in the iPatFitter from 15 to 4 for the track cleaning. This reduces the MuonCombinedAlg time by 25-30% and the total chain time by 5-10% for low pT muon triggers with a very minimal impact on the muons reconstructed.

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