webos-image: Update layer pins for 2013-08-22

meta-webos as of 2013-08-22 17:48:10 -0700

f98963c webos-image: app-services=4
2aaba6e base-files: Add bbappend to mount /var/db/temp at tmpfs
92bb7ab recipes: Replace PR_append with EXTENDPRAUTO_append

Open-webOS-DCO-1.0-Signed-off-by: Susan Montooth <susan.montooth@lge.com>