Make default layer size 16-bit (#15286)

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

keyboards/preonic/keymaps/dudeofawesome/keymap.c

@@ -275,7 +275,7 @@ bool numpadActive = false;
 float tone_numpad_on[][2] = SONG(NUMPAD_ON_SOUND);
 
 void matrix_scan_user (void) {
-  uint8_t layer = biton32(layer_state);
+  uint8_t layer = get_highest_layer(layer_state);
 
   switch (layer) {
     case _NUMPAD:

keyboards/preonic/keymaps/senseored/keymap.c

@@ -367,7 +367,7 @@ bool dip_switch_update_user(uint8_t index, bool active) {
 
 layer_state_t layer_state_set_user(layer_state_t state) {
 //  if(rgblight_get_mode() == 1) {
-    switch (biton32(state)) {
+    switch (get_highest_layer(state)) {
     case _QWERTY:
         if(bnumlock) {
             tap_code(KC_NLCK);