Update FastShowerCellBuilderTool_test.py -- use only status=2 for particles

Andrii Verbytskyirequested to merge
averbyts-23.0-patch-86447 into 23.0

Update FastShowerCellBuilderTool_test.py -- use only status=2 for particles

Tag @jchapman

Should fix https://its.cern.ch/jira/browse/ATLASSIM-6610

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