Enable workaround for checkboxes in tables also on Linux
On MacOS, due to compatibility issues with current graphics libraries, a
workaround has already been in place for a long time to display [X]
has a checkmark instead of an on-the-fly screenshot of a checkbox (see
#2443 (closed)).
Since the same problem is also frequent on Linux, the workaround is also enabled there.
Once the new JavaFX based implementation of allocation tables (#3915) and annotation view (#4014 (closed)) will be finalized, only little to no code will be actually use SWT-based tables with checkmarks.
(from redmine: issue id 4032, created on 2020-06-26, closed on 2020-06-30)