dingux-commander: Update to match upstream config split

This fixes the button labeling on GCW Zero, by letting the build know
which device we're building for.
dingux-commander: Let gmenu2x use icon from skin
pyclock: Let gmenu2x use icon from skin
opendingux: GCW0: defconfig: Enable "badblocks" tool

It can be used to scan block devices for I/O errors.