message: Update aff_trans.cpp
  When the fullAffine parameter is set to false, the estimateRigidTransform function maybe return empty, then the _localAffineEstimate function will be called, but the bug in it will result in incorrect results.
diff: @@ -165,8 +165,8 @@ static Mat _localAffineEstimate(const std::vector<Point2f>& shape1, const std::v
  }
  else
  {
  - therow.at<float>(0,0)=-shape1[contPt].y;
  - therow.at<float>(0,1)=shape1[contPt].x;
  + therow.at<float>(0,0)=shape1[contPt].y;
  + therow.at<float>(0,1)=-shape1[contPt].x;
  therow.at<float>(0,3)=1;
  therow.row(0).copyTo(matM.row(ii));
  matP.at<float>(ii,0) = shape2[contPt].y;
  