Unresponsive up/down arrows in SVG Export dialog

[debraspicher]

Minor issue, but it needs reporting. Mouse wheel works much better.

https://1drv.ms/u/s!AuWHX0h5bAoRipdPo1PSQ2RpxC9b1w?e=bUomZK

[VectorStyler]

@debraspicher I added this to the backlog.