Add a do not show again checkbox in the drag and drop multiple files pop up

[thatguymendel]

In the 2.9-alpha1 release you are now able to drag multiple 3fm files or a 3mf and stl file into prusaslicer at the same time. This is great if you have models that you print often and would like to customize the settings on each one but print at the same time. Now you can easily drag them into PS at the same time instead of one by one.

Currently there is a pop up when you do this telling you that only the geometry will be loaded into PS.
It would be great if you could select a "do not show again" box.