fix(scale): fix the issue of needle sliding in scale (#6343)

Signed-off-by: lhdjply <lhdjply@126.com>

examples/widgets/scale/lv_example_scale_3.c

@@ -80,9 +80,6 @@ void lv_example_scale_3(void)
     lv_scale_set_angle_range(scale_img, 270);
     lv_scale_set_rotation(scale_img, 135);
 
-    /* so the needle image cannot be scrolled*/
-    lv_obj_remove_flag(scale_img, LV_OBJ_FLAG_SCROLLABLE);
-
     /* image must point to the right. E.g. -O------>*/
     needle_img = lv_image_create(scale_img);
     lv_image_set_src(needle_img, &img_hand);