AthExHelloWorld: Update reference file.

Fix test failure in master.

This merge request affects 1 package:

• Control/AthenaExamples/AthExHelloWorld

added Core master review-pending-level-1 labels

CI Result FAILURE

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-21196-2019-02-16-17-45
Athena: number of compilation errors 0, warnings 3
AthSimulation: number of compilation errors 0, warnings 1
For experts only: Jenkins output [CI-MERGE-REQUEST 33955]

Failure seen in AthSimulation not due to this change --- a required package is missing in that build. This change is ok to merge.

Fully agree, this change has nothing to to with failing test in simulation, approving.

Pavol [as L2 MR shifter]

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

merged

mentioned in commit ec25b753

added sweep:ignore label