Remove extra step from flight import if Simbrief is the only option

I use navigraph on a chromebook and it doesn’t support file imports like on pc, and with the buttons being rather small it’s hard enough to click on the “Import from SimBrief” button after clicking on “Import Flight” … since there is only that one option (for now anyway), why show it at all?

I know there will be some code checking what options are available and build up those menu options, so if that only returns one, whatever it might be - just auto select it for us.