PDF Preview CSS rules stretch the landscape image

[Mikk36]

If the previewed document is in landscape and wider than the preview window, it stretches the preview, because the height is hardcoded with CSS. Disabling at least the height rule fixes this.

Original rules:

Disabled rules:

The offending rules seem to come from here: https://github.com/haiwen/seahub/blob/master/seahub/templates/snippets/pdfjs_file_viewer.html#L54