BUG: update test with more correct visibility toggles

Digging into the missing fiducials data I realised that on MRB
load and then scene view restore the individual fiducial visibility
will not get saved/restored in scene views since that information is
saved in the file on disk, only the list level visibility is saved.
Updated the test to only test list level fiducial visibility.

TBD: find a backward compatible way to move the per markup visibility
into the markups display node. This behaviour is confusing since
from a freshly started Slicer in which you create new scene views, the
per markup visibility toggling does work (node copies are in memory),
it will just cease to work once the scene is saved to disk and then
re-opened.

Issue 0003956

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24375 3bd1e089-480b-0410-8dfb-8563597acbee