Minor fix in ConcentrationModel.integrated_concentration

Nicolas Mounetrequested to merge
develop/quick_fix_integration into master

Replacing start and stop by resp. req_start and req_stop in the if statement at the start of the loop. It actually doesn't change the behaviour but the code is much clearer.

Fixing https://gitlab.cern.ch/cara/cara/-/merge_requests/176#note_4468409

Edited by Nicolas Mounet

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