Fix for ttbar -> WcbWll Pythia8 showering [skip modfiles]

Yi Yurequested to merge
yi-ttbarshower into master

Description of bug

the inputFilesPerJob is at the number threshold of reshowering LHE files ATLMCPROD-10231

Changes introduced

adjust inputFilesPerJob to a 1.1 times one

Tests

Issues resolved

Closes #

Edited by Yi Yu

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