McParticleTools: Fix compilation with hepmc2.

Syntax error.

This merge request affects 1 package:

• PhysicsAnalysis/TruthParticleID/McParticleTools

This merge request affects 1 file:

• PhysicsAnalysis/TruthParticleID/McParticleTools/src/OldSpclMcFilterTool.cxx

added Analysis main review-pending-level-1 labels

CI Result SUCCESS (hash 5d6bc1dd)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 2748]

removed review-pending-level-1 label

added review-approved label

mentioned in commit cffb6a92

merged