[sift] fix (x, y) swap when reading sift keypoints from a file
[sift] fix (x, y) swap when reading sift keypoints from a file

MISS3D/s2p,MISS3D/s2p,dyoussef/s2p,MISS3D/s2p,carlodef/s2p,jmichel-otb/s2p,jmichel-otb/s2p,jmichel-otb/s2p,mnhrdt/s2p,carlodef/s2p,jmichel-otb/s2p,MISS3D/s2p,dyoussef/s2p,mnhrdt/s2p,dyoussef/s2p,dyoussef/s2p