TrkMeasurementUpdator: Fix eigen matrix initialization.

Initializing an eigen matrix from a scalar can result in a dimension mismatch assertion failure; the array here is 1x1, and a scalar is treated as dimension 0. Move the setting of the matrix element to an assignment, rather than in the constructor, to resolve this.

This merge request affects 1 package:

• Tracking/TrkTools/TrkMeasurementUpdator

added Tracking master review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-25019-2019-07-22-08-13
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 1337]

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

merged

mentioned in commit b2ca185e

added sweep:ignore label