Increase html body height to full content height
Increase html body height to full content height

Signed-off-by: Raimund Schlüßler <3d08f26b16584b436f9d758cbb0d5bcfaf208387@mailbox.org>

andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,nextcloud/server,nextcloud/server