* [Keyboard] Change default implementation for get_layer_name_user
Will now show the layer number instead of "Unknown", since this is
what will be shown if QMK Configurator is used to compile the
firmware.
* [Keyboard] Update the layout info
This makes it look sort of like a macropad + gamepad rather than an 4x6
ortholinear keyboard.
* [Keyboard] Fix default implementation of get_layer_name_user
Based on feedback from code review the implementation was swapped in
favor of using get_u8_str. This implied a change to the argument type
from int to uint8_t, which cascaded into the existing keymaps. (This
made sense in general, since the return type of get_highest_layer is
also a uint8_t.)