BCM_Digitization: Fix cppcheck warning.

Pass container by const reference, not by value.

This merge request affects 1 package:

• InnerDetector/InDetDigitization/BCM_Digitization

This merge request affects 2 files:

• InnerDetector/InDetDigitization/BCM_Digitization/src/BCM_DigitizationTool.cxx
• InnerDetector/InDetDigitization/BCM_Digitization/src/BCM_DigitizationTool.h

Adding @sroe ,@jchapman ,@goetz as watchers

added Digitization InnerDetector main review-pending-level-1 labels

CI Result SUCCESS (hash 79a33888)

	Athena
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9047] (remote access info)

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

Cheers, Qiyu, L1

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit 2563b1c8