Drop old linter setting (GRPC's reflection)

[joanlopez]

What?

It removes an old linter setting, set for gRPC's reflection.

Why?

Because the issue used to track it was completed some months ago.
So, it should no longer be required, or we should re-open it create a new issue.

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make tests) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Related PR(s)/Issue(s)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.80%. Comparing base (93649df) to head (c755f1c).

❗ Current head c755f1c differs from pull request most recent head a53d946

Please upload reports for the commit a53d946 to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3769      +/-   ##
==========================================
- Coverage   70.88%   70.80%   -0.08%     
==========================================
  Files         291      289       -2     
  Lines       21226    21221       -5     
==========================================
- Hits        15045    15026      -19     
- Misses       5216     5226      +10     
- Partials      965      969       +4     

Flag	Coverage Δ
ubuntu	70.80% <ø> (-0.03%)	⬇️
windows	?

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