fix: correct the "plonk" benchmarking

[guorong009]

Description

Correct the plonk benchmarking code - prover and verifier bench

Related issues

• None

Changes

• set the number of instances in bench as 0

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.64%. Comparing base (bc857a7) to head (3b7fd80).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #360   +/-   ##
=======================================
  Coverage   82.64%   82.64%           
=======================================
  Files          84       84           
  Lines       17750    17750           
=======================================
  Hits        14670    14670           
  Misses       3080     3080           

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[davidnevadoc]

Good catch!