Bind confirm just once and not once per upload.
Bind confirm just once and not once per upload.

Also clear the uploda information after upload or when the dialog open.

Alterntaive fix for https://github.com/OctoPrint/OctoPrint-Slic3r/pull/12

OctoPrint/OctoPrint-Slic3r,OctoPrint/OctoPrint-Slic3r