Make default layer size 16-bit (#15286)

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

keyboards/percent/canoe/keymaps/dhertz/keymap.c

@@ -49,8 +49,8 @@ void keyboard_post_init_user(void) {
     rgblight_sethsv_teal();
 }
 
-uint32_t layer_state_set_keymap(uint32_t state) {
-    switch (biton32(state)) {
+layer_state_t layer_state_set_keymap(layer_state_t state) {
+    switch (get_highest_layer(state)) {
         case 1:
             rgblight_sethsv_noeeprom_magenta();
             break;