Fix pivot basic rewrite with new PyZX version

[colltoaction]

This draft uncovers the issue with pivoting which I will solve next. cc @RazinShaikh. #256

Traceback (most recent call last):
  File "/home/mcoll/repos/github.com/colltoaction/zxlive/zxlive/rewrite_action.py", line 281, in do_rewrite
    node.rewrite_action.do_rewrite(self.proof_panel)
  File "/home/mcoll/repos/github.com/colltoaction/zxlive/zxlive/rewrite_action.py", line 114, in do_rewrite
    g, rem_verts = self.apply_rewrite(g, matches)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mcoll/repos/github.com/colltoaction/zxlive/zxlive/rewrite_action.py", line 129, in apply_rewrite
    etab, rem_verts, rem_edges, check_isolated_vertices = self.rule(g, matches)
                                                          ^^^^^^^^^^^^^^^^^^^^^
  File "/home/mcoll/repos/github.com/colltoaction/zxlive/zxlive/rewrite_data.py", line 117, in rule
    simplification(g)
  File "/home/mcoll/.local/lib/python3.11/site-packages/pyzx/simplify.py", line 109, in pivot_simp
    return simp(g, 'pivot_simp', match_pivot_parallel, pivot, matchf=matchf, quiet=quiet, stats=stats)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mcoll/.local/lib/python3.11/site-packages/pyzx/simplify.py", line 98, in simp
    g.remove_edges(rem_edges)
  File "/home/mcoll/.local/lib/python3.11/site-packages/pyzx/graph/multigraph.py", line 237, in remove_edges
    self.remove_edge(e)
  File "/home/mcoll/.local/lib/python3.11/site-packages/pyzx/graph/multigraph.py", line 240, in remove_edge
    s,t,ty = edge
    ^^^^^^
ValueError: not enough values to unpack (expected 3, got 2)

[colltoaction]

some debugging points at

https://github.com/zxcalc/pyzx/blob/d81356b656ace618f4112266595d63415ac35dee/pyzx/rules.py#L683

check bialgebra