TrigTruthEventTPCnv: Fix gcc9 warnings.

In C++11, implicit declarations of copy and assignment are deprecated if the class has a user defined destructor or copy or assignment. gcc9 now warns about this by default. Adjust to avoid the warning.

This merge request affects 1 package:

• Trigger/TrigTruthEvent/TrigTruthEventTPCnv

added Trigger master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20310-2019-01-11-20-45
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 32157] (for remote access see the FAQ for MR reviewers)

merged

mentioned in commit b27adcda

added sweep:ignore label