Kindle: Make sure Device:untar actually works

The fuse proxy strikes again... Fix #9704

frontend/device/kindle/device.lua

@@ -368,6 +368,11 @@ function Kindle:readyToSuspend()
     self.suspend_time = time.boottime_or_realtime_coarse()
 end
 
+-- We add --no-same-permissions --no-same-owner to make the userstore fuse proxy happy...
+function Kindle:untar(archive, extract_to)
+    return os.execute(("./tar --no-same-permissions --no-same-owner -xf %q -C %q"):format(archive, extract_to))
+end
+
 function Kindle:setEventHandlers(UIManager)
     UIManager.event_handlers.Suspend = function()
         self.powerd:toggleSuspend()