ISF_FastCaloSimEvent: Fix placement of using declaration.

Don't put a using declaration in the global namespace in a header.

This merge request affects 1 package:

• Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimEvent

This merge request affects 1 file:

• Simulation/ISF/ISF_FastCaloSim/ISF_FastCaloSimEvent/ISF_FastCaloSimEvent/VNetworkBase.h

Adding @jchapman ,@jbeirer ,@tadej ,@zhangr ,@schaarsc as watchers

added Simulation main review-pending-level-1 labels

CI Result SUCCESS (hash cdd14da6)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 6306] (remote access info)

MR looks fine from L1 perspective, CI shows no problems - approving.

L1 shifter

removed review-pending-level-1 label

added review-approved label

mentioned in commit e0aeb036

merged