Ensure changes to Camera2D's limits don't affect smoothed_camera_pos

scene/2d/camera_2d.cpp

@@ -436,7 +436,9 @@ void Camera2D::clear_current() {
 void Camera2D::set_limit(Margin p_margin, int p_limit) {
 	ERR_FAIL_INDEX((int)p_margin, 4);
 	limit[p_margin] = p_limit;
+	Point2 old_smoothed_camera_pos = smoothed_camera_pos;
 	_update_scroll();
+	smoothed_camera_pos = old_smoothed_camera_pos;
 }
 
 int Camera2D::get_limit(Margin p_margin) const {