L1TopoConfig: Fix cppcheck warnings.

Pass objects by const reference, not by value.

This merge request affects 1 package:

• Trigger/TrigT1/L1Topo/L1TopoConfig

This merge request affects 2 files:

• Trigger/TrigT1/L1Topo/L1TopoConfig/L1TopoConfig/L1TopoConfigAlg.h
• Trigger/TrigT1/L1Topo/L1TopoConfig/Root/L1TopoConfigAlg.cxx

Adding @jmharris ,@paulama ,@asonay ,@iriu ,@cmorenom ,@oliveirg ,@stelzer ,@orlando as watchers

added Trigger main review-pending-level-1 labels

CI Result SUCCESS (hash c26c46d4)

	Athena	DetCommon
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
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 5774] (remote access info)

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

merged

mentioned in commit 3fe1e636