Fix typo in test_MC20a_ATLFAST3F_G4MS_pileup_ttbar_CAvsCG ART job

Merged John Derek Chapman requested to merge jchapman/athena:FastChainCGFix_23.0 into 23.0

Command-line option should have been preInclude rather than preSimInclude for the legacy configuration job.

NB This merge request only updates an ART script, so will have no effect on the CI output.

Tagging @pagacova

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