ParticleGun: fix flake8-bugbear warning

B004: use callable to check for callables

This merge request affects 1 package:

• Generators/ParticleGun

This merge request affects 1 file:

• Generators/ParticleGun/python/samplers.py

added Generators main review-pending-level-1 labels

CI Result SUCCESS (hash 27fb62c6)

	Athena	AthGeneration
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 8930] (remote access info)

The changes are straightforward and there are no issues with the CI. Approving from L1.

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit ea575405