PixelDigitization+PixelRadDamDigitization: Fix irreproducibilities.

Merged Scott Snyder requested to merge ssnyder/athena:ordered.PixelDigitization-20200114 into master

Fix places where we iterated over an unordered_map doing things that were actually order-dependent. This was causing results to change with different compiler versions.

Edited by Scott Snyder

Merge request reports