Commit 1f43e4d breaks the hyperplonk compilation

[alxkzmn]

https://github.com/privacy-scaling-explorations/chiquito/commit/1f43e4df4d0be77e49b6cb7c5d62dd4ab04cbb71

Steps to reproduce:

cargo run --example fibonacci  -- --nocapture

thread 'main' panicked at ~/.cargo/git/checkouts/plonkish-69cbf4324857e2fa/e0125fe/plonkish_backend/src/poly/multilinear.rs:52:13:
assertion `left == right` failed
  left: 17
 right: 16

Previous commit (6bbe1fe) is still working fine.

[leolara]

Fix if it is easy to fix :-) but not a priority now

[alxkzmn]

Fixed in #286