cm: Update default wallpaper for sw600dp/sw720dp devices

Change-Id: I99bd1f7d7f735279a5c3e0e7d54220f5f647644e
Merge "cm: Update default wallpaper for sw600dp/sw720dp devices" into cm-11.0
Merge pull request #39 from CyanogenMod/cm-11.0

Cm 11.0