Add key positions for keypad

[aido]

Hi,

positions.py lists key positions for various UI elements but seems to be missing positions for keypad.

Could positions for keypad digits be added similar to those here:
https://github.com/LedgerHQ/app-seed-tool/blob/develop/tests/functional/keypad.py

or here, with additional APEX_P key positions:
https://github.com/aido/app-seed-tool/blob/3b616ed706adc0f04b92e2cd909a6996021af370/tests/functional/keypad.py