Fix bindcode by offsetting xkb keycode by 8
Fix bindcode by offsetting xkb keycode by 8

The bindcode has to be offset by 8 to match the keycode we get from wlc.

https://github.com/xkbcommon/libxkbcommon/blob/master/xkbcommon/xkbcommon.h#L160

4e554c4c/sway,sleep-walker/sway,ptMuta/sway,SirCmpwn/sway,4e554c4c/sway,1ace/sway,taiyu-len/sway,crondog/sway,mikkeloscar/sway,taiyu-len/sway,crondog/sway,ascent12/sway,1ace/sway,sleep-walker/sway,ascent12/sway,1ace/sway,taiyu-len/sway,mikkeloscar/sway,ascent12/sway,johalun/sway