Fix compilation warnings under gcc13 and clang16
Summary:
Fix compilation warnings under gcc13 and clang16
Additionally fix FSR options in one test JSON file
Test Plan: All tests give identical results
Reviewers: jback, abudinen, kreps
Reviewed By: abudinen
Subscribers: #evtgen_admins
Tags: #evtgen
Differential Revision: https://phab.hepforge.org/D122