CA: try to restore SWT.VIRTUAL for columns and rows information table viewers

To temporary fix the issues #4085 (closed) and #3966 (closed) the TableViewer virtual functionality has been disabled (see org.txm.ca.rcp.editors.ColsRowsInfosEditor.viewer, c2cc9cf0).

It would be better to re-enable it if possible. Need to investigate and find the origin of the "null pointer" exception (Windows only) and the "index out of bounds" exception (all OS).