Made specific buttons be button-<name> instead of button.<name>

[chaz/openbox] / data / xbm / shade_toggled.xbm

#define iconify_width 6
#define iconify_height 6
static unsigned char iconify_bits[] = {
   0x3f, 0x3f, 0x00, 0x00, 0x00, 0x00 };