FTK_RecTools: Fix clang warnings.

clang warnings: missing override keyword, braces in initializers, unused function.

This merge request affects 1 package:

• Trigger/TrigFTK/FTK_RecTools

Adding @benhoob ,@jahreda ,@karolos ,@mswiatlo as watchers

added Trigger master review-pending-level-1 labels

CI Result FAILURE

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-20434-2019-01-18-08-38
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST 32390] (for remote access see the FAQ for MR reviewers)

Unrelated known failure in overlay tests.

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

merged

mentioned in commit 682c4e45

added sweep:ignore label