CMake

c0ae1754 test(HTGGhostCells): update test with new random source masks
6d4eef7a test(RandomHTGSource): update test baseline.
eaf6300e fix(RandomHTGSource): make the distribution more appealing with large masks.

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Reviewed-by: Charles Gueunet <charles.gueunet@kitware.com>
Reviewed-by: Louis Gombert <louis.gombert@kitware.com>
Acked-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11080