double size on retina displays

[samamou]

See how the arrows on the ports aren't too clear/visible

[jcelerier]

if you're interested in playing with a better rendering on your side, the code for the drawing is there:

https://github.com/ossia/score/blob/master/src/plugins/score-lib-process/Process/Dataflow/PortItem.cpp#L225-L255