Add Haute42/COSMOX R16 16a button layout as a display layout

[longxa762]

https://cosmoxgaming.com/hautepad/r16/

Latest haute42 board have a new layout for Stickless 16 that move the left thumb button to left pinky.

The firmare 0.7.9 update added the button layout to the "Custom LED Theme" page called "Stickless 16 A" but it's not available yet as a display layout.

[TheTrainGoes]

Hi @longxa762 ,

To be clear, we do not add new stuff into the firmware 'just because' Haute42 has a new device out.

If there is enough demand for a layout we can look to get it added in.