fix(display): fix inconsistency in the API (#5136)

src/widgets/canvas/lv_canvas.c

@@ -357,7 +357,7 @@ void lv_canvas_finish_layer(lv_obj_t * canvas, lv_layer_t * layer)
 {
     while(layer->draw_task_head) {
         lv_draw_dispatch_wait_for_request();
-        lv_draw_dispatch_layer(lv_obj_get_disp(canvas), layer);
+        lv_draw_dispatch_layer(lv_obj_get_display(canvas), layer);
     }
 }