fix upscale loop erroneously applied multiple times

        self.scale = scale

        dest_w = img.width * scale

        dest_h = img.height * scale

        for i in range(3):

            if img.width > dest_w and img.height > dest_h:

                break

            shape = (img.width, img.height)

            img = self.do_upscale(img, selected_model)

            if shape == (img.width, img.height):

                break

            if img.width >= dest_w and img.height >= dest_h:

                break

        if img.width != dest_w or img.height != dest_h:

            img = img.resize((int(dest_w), int(dest_h)), resample=LANCZOS)