2 minor issues on the flasher

[exadeci]

Thanks for this awesome app !

I've noticed 2 small issues with the flasher:

1. Sometimes the material + button doesn't render on the bottom right of the screen but it goes on top of the "Select your recovery variant"

2. When pressing that button, in the Recent files if you long press an item you can press on Open and it should select it but it doesn't work with DeviceControl, the workaround is to use another source from the "Open from" navigation menu.