DerivationFrameworkCalo: Fix cppcheck warning.

Prefer pre-increment to post-increment for iterator classes.

Build area was cleaned as per request posted in the DB. The full software build will be performed

This merge request affects 1 package:

• PhysicsAnalysis/DerivationFramework/DerivationFrameworkCalo

This merge request affects 1 file:

• PhysicsAnalysis/DerivationFramework/DerivationFrameworkCalo/src/GainDecorator.cxx

Adding @jcatmore ,@calpigia ,@emmat as watchers

added Derivation main review-pending-level-1 labels

The system determined that CI tests (with names matching "^CITest_SimulationRun(2|3)(FullSim|Hit).*$") are not needed for this code change. They are not run. This is not an indicator to restart the job.

CI Result SUCCESS (hash b994afc4)

	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-CC7 76941]

removed review-pending-level-1 label

added review-approved label

mentioned in commit 3684a8b0

merged