Make default layer size 16-bit (#15286)

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

users/talljoe/talljoe.c

@@ -138,7 +138,7 @@ void matrix_init_user(void) {
   }
 }
 
-uint32_t default_layer_state_set_kb(uint32_t state) {
+layer_state_t default_layer_state_set_kb(layer_state_t state) {
   // persist changes to default layers
   eeconfig_update_default_layer(state);
   return state;