RHadrons: Flake8 fixes

Fixes build warning in master.

This merge request affects 1 package:

• Simulation/G4Extensions/RHadrons

Adding @jchapman ,@zmarshal ,@vpascuzz as watchers

added Simulation master review-pending-level-1 labels

CI Result SUCCESS (hash 000ec773)

	Athena	AthSimulation	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 11128]

merged

mentioned in commit b2684e13

added sweep:ignore label