Make default layer size 16-bit (#15286)

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

keyboards/handwired/tritium_numpad/keymaps/blu/keymap.c

@@ -9,7 +9,7 @@ void keyboard_pre_init_user(void)
 layer_state_t layer_state_set_user(layer_state_t state)
 {
 	// Switch layer LED accordingly
-    switch (biton32(state)) {
+    switch (get_highest_layer(state)) {
     case 0:
         writePinHigh(B0);
         break;