refactor(snapshot): use draw buffer interface (#5487)

Signed-off-by: Xu Xingliang <xuxingliang@xiaomi.com>
Co-authored-by: Benign X <1341398182@qq.com>

examples/others/snapshot/lv_example_snapshot_1.c

@@ -7,9 +7,9 @@ static void event_cb(lv_event_t * e)
     lv_obj_t * img = lv_event_get_target(e);
 
     if(snapshot_obj) {
-        lv_image_dsc_t * snapshot = (void *)lv_image_get_src(snapshot_obj);
+        lv_draw_buf_t * snapshot = (lv_draw_buf_t *)lv_image_get_src(snapshot_obj);
         if(snapshot) {
-            lv_snapshot_free(snapshot);
+            lv_draw_buf_destroy(snapshot);
         }
 
         /*Update the snapshot, we know parent of object is the container.*/