webos-image: Update layer pins for 2013-07-26

meta-webos as of 2013-07-26 17:38:26 -0700

3e88c59 webos-image: librolegen=18,v2.1.0

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