STYLE: qMRMLTableView: Prefer function instead of macro

For sake of consistency with the rest of the code base, this commit
remove the macro introduced in r24783 (ENH: Added support for Tables)
and instead use a function.

Reviewed-by: Andras Lasso <lasso@queensu.ca>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@24858 3bd1e089-480b-0410-8dfb-8563597acbee