CaloCellList fix indent

Inconsistent tabs and spaces made the indentation a bit wonky. Not an essential change but it was bugging me.

This merge request affects 1 package:

• Calorimeter/CaloUtils

This merge request affects 1 file:

• Calorimeter/CaloUtils/src/CaloCellList.cxx

Adding @pavol as watcher

added Calorimeter main review-pending-level-1 labels

CI Result SUCCESS (hash 140ece2a)

	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 4124]

removed review-pending-level-1 label

added review-approved label

merged

mentioned in commit d5df4f1e