TrigEgammaAnalysisTools: Fix placement of using directives.

Do not put using directives in the global namespace in headers.

This merge request affects 1 package:

• Trigger/TrigAnalysis/TrigEgammaAnalysisTools

added Egamma Trigger master review-pending-level-1 labels

CI Result SUCCESS (hash 9b11c9a3)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 10588]

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

merged

mentioned in commit 3f360b64

added sweep:ignore label