Minor ui improvements
Description
Simplify reset of points/regions in freehand crop by using single slot for reset.
Correct the accordion menu icon placement.
Others minor improvements on new ircad style QSS
Closes #1196 (closed)
How to test it?
sight_viewer and project that make use the new theme.
Make sure in sight_viewer to check that the small triangle icon of accordion menu is well placed (at bottom right).