STYLE: Fix position of DataProbe display using monospace font and fixed width

This commit refactor and simplify the DataProbe widget to ensure the
display of viewer properties and layer information is displayed at the
same location.

Co-authored-by: Jean-Christophe Fillion-Robin <jchris.fillionr@kitware.com>

From: Sergey Aleshin <4memph@gmail.com>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24163 3bd1e089-480b-0410-8dfb-8563597acbee