remove spurious print-statement in TestBeamConfigFlags.py

Walter Lamplrequested to merge
wlampl/athena:removeSpuriousPrintout into master

In noticed that loading config-flags creates a log line like In createTestBeamConfigFlags

This MR removes this printout.

BTW, git grep "In createTestBeamConfigFlags" -- "ref" turned up nothing, the line didn't make it in any reference log-file.

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