check_cyclic crashes

[mirefek]

This line https://github.com/google-deepmind/alphageometry/blob/1357929e91bd327a015b26a94664035dc40b76b7/numericals.py#L705 Should not contain the parentheses, like

  a, b, c, *ps = points 

Otherwise, it crashes on:

TypeError: cannot unpack non-iterable Point object