[avalanche] Use sane default for the minimum number of nodes that sent compact proofs

Summary:
This param is used to determine when we are confident we have the right set of proofs in our quorum.
This is similar to D11917 and D11918.

Depends on D11918.

Test Plan:

ninja all check-extended

Reviewers: #bitcoin_abc, PiRK, sdulfari

Reviewed By: #bitcoin_abc, PiRK, sdulfari

Subscribers: sdulfari

Differential Revision: https://reviews.bitcoinabc.org/D11919