TrkV0Fitter: Fix gcc11 warnings.

Make sure Eigen objects are initialized. Fixes uninitialized variable warnings from gcc.

This merge request affects 1 package:

• Tracking/TrkVertexFitter/TrkV0Fitter

This merge request affects 1 file:

• Tracking/TrkVertexFitter/TrkV0Fitter/src/TrkV0VertexFitter.cxx

Adding @bouhova ,@amorley as watchers

added Tracking master review-pending-level-1 labels

CI Result SUCCESS (hash 9ed0b35f)

	Athena	AthSimulation	AthGeneration	AnalysisBase
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
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 25347]

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

merged

mentioned in commit 24aef416

added sweep:ignore label