webos-image: Update layer pins for 2013-08-26

meta-webos as of 2013-08-26 17:03:47 -0700

26d2f48 connman=webos3
74682dd Revert "recipes: Replace PR_append with EXTENDPRAUTO_append"

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