Remove a few un-needed dynamic_cast from egammaTrkRefitter

A few of the dynamic casts could be avoided.

2 were completely needless as the function returns the correct type anyhow. Other 2 could be done via checking the type()

Mentioning @amorley

This merge request affects 1 package:

• Reconstruction/egamma/egammaTrackTools

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

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-23537-2019-05-18-23-24
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 38655]

changed the description

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

merged

mentioned in commit 644cd54d

added sweep:ignore label