simple-scan: update 3.17.4 -> 3.17.90

Adds a dependency on PackageKit...

In better news:
 - Default to PDF when saving in all cases.
 - Always show file format options and use a combo box to fit better into
   dialog.
 - Detect HP scanners and install drivers using PackageKit if found.
 - If SANE detects no scanners but we see USB IDs of Brother, Epson or
   Samsung scanners then prompt the user to go to their website to install
   drivers.
 - Use GUsb instead of GUdev.
 - Fix error dialogs not showing.