Fixed the window resizing bug when saving a patch with optimal zoom, closing...

Fixed the window resizing bug when saving a patch with optimal zoom, closing it, and then reopening it (see http://disis.music.vt.edu/pipermail/l2ork-dev/2020-August/002901.html). Please note that this will need to be reverted once we migrate to nw.js 0.46+ (as per provided comment inside the canvas_check_geometry. Also improved the patch scrollbars to be flush against the window edges.