Make default layer size 16-bit (#15286)

Co-authored-by: James Young <18669334+noroadsleft@users.noreply.github.com>

users/billypython/billypython.c

@@ -23,7 +23,7 @@ bool process_record_user(uint16_t keycode, keyrecord_t *record) {
 }
 
 __attribute__((weak))
-uint32_t layer_state_set_keymap(uint32_t state) {
+layer_state_t layer_state_set_keymap(layer_state_t state) {
   return state;
 }
 

users/billypython/billypython.h

@@ -31,4 +31,4 @@ enum layers_user {
 };
 
 bool process_record_keymap(uint16_t keycode, keyrecord_t *record);
-uint32_t layer_state_set_keymap(uint32_t state);
+layer_state_t layer_state_set_keymap(layer_state_t state);