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DiTauMassTools: Update parametrisation file for MMC

Michael Hubner requested to merge mihuebne/athena:21.2-MMC-update-root-file into 21.2

This MR is an update of the default parametrisation file that is used in the MMC. The new file fixes a performance issue for leptonic taus. The corresponding file was uploaded here: ATLINFR-3326

Additionally, with this MR the definition of pi from TMath will be used.

pinging @ademaria

Edited by Michael Hubner

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