Fix sorting of saddle connections in byLength() iteration #468

Job	Run time
distcheck	15m 5s
test-libflatsurf (ubuntu-22.04, check, 2)	20m 52s
test-pyflatsurf (macos-11, 3.8, 2, check)	36m 6s
test-libflatsurf (ubuntu-22.04, check, 3)	20m 32s
test-pyflatsurf (macos-11, 3.9, 2, check)	34m 30s
test-libflatsurf (macos-11, check, 2)	20m 48s
test-pyflatsurf (macos-11, 3.10, 2, check)	35m 32s
test-libflatsurf (macos-11, check, 3)	20m 49s
test-pyflatsurf (macos-11, 3.11, 2, check)	34m 29s
test-libflatsurf (ubuntu-22.04, check-valgrind, 2)	11m 54s
test-pyflatsurf (ubuntu-22.04, 3.8, 2, check)	14m 40s
test-libflatsurf (ubuntu-22.04, check-valgrind, 3)	11m 10s
test-pyflatsurf (ubuntu-22.04, 3.9, 2, check)	14m 29s
test-pyflatsurf (ubuntu-22.04, 3.10, 2, check)	14m 39s
test-pyflatsurf (ubuntu-22.04, 3.11, 2, check)	14m 13s
test-pyflatsurf (ubuntu-22.04, 3.11, 2, check-valgrind)	14m 16s
	5h 34m 4s

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