Don't apply default zoom level to single image pages
My default zoom level is set to 120%. When visiting a direct link to a .jpg file, it's also zoomed in to 120%. For smaller images this isn't really bothersome, but for images larger than my screen, it means they have to be scrolled left and right and up and down to see them completely, and there's no way to make the image fit the window unless by changing the zoom level. At 100% default zoom, images larger than the window still fit.