FsrUtils: Fix cppcheck warnings.

Pass objects by const reference, not by value.

This merge request affects 1 package:

• PhysicsAnalysis/AnalysisCommon/FsrUtils

This merge request affects 2 files:

• PhysicsAnalysis/AnalysisCommon/FsrUtils/FsrUtils/FsrPhotonTool.h
• PhysicsAnalysis/AnalysisCommon/FsrUtils/Root/FsrPhotonTool.cxx

added Analysis Egamma analysis-review-required main review-pending-level-1 labels

CI Result SUCCESS (hash 62ffaadc)

	Athena	AnalysisBase	AthAnalysis
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 10519] (remote access info)

removed review-pending-level-1 label

added review-approved label

removed analysis-review-required label

added analysis-review-approved label

Approving from analysis side. Tong (AR)

mentioned in commit a9fac55d

merged