[Request] Reset the card picking after loading new PDF

[Toxaris-NL]

Please describe the problem the feature is supposed to solve.

I have some PDF's where there are empty cards so I remove them from the card list. However, if I then load a new PDF with the same settings, the selected cards field is not reset.

Describe the solution you'd like

It would be nice if those kind of fields would reset when loading a new PDF. Other fields can retain their values as it would make it easier to handle expansions.

[foosel]

Good point!