DigitizationTestsMT Removing line breaks in some input file paths (ATLASSIM-6879)

John Derek Chapmanrequested to merge
jchapman/athena:FixATLASSIM-6879_main into main

Some input file paths contained line breaks. This seems to be the cause of ATLASSIM-6879.

Tagging @tstreble, @tqiu, @zhubacek

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