Fix unwanted offset after cancel slide show.

When running a presentation that does not fill the full screen e.g. due to
screen ratio and slide ratio do not match and the presentation is stopped
during the presentation there can be an offset in the slide after the presentation
mode is left. The offset happens only if the zoom level is smaller then the screen
or it is fit to screen/fit to width. Zooming in fixes the problem once the slide
is bigger then the screen.

BUG: 306118