fix: revert anchor block PTC vote override

[lodekeeper]

Summary

Revert the anchor-block PTC vote all-true override added in #9188.

Upstream consensus-specs master fixed the underlying spec bug in:

• c7a0a8527 — Remove incorrect anchor seed for payload votes (Release v1.4.3 #5135)

specs/gloas/fork-choice.md#get_forkchoice_store on master now initializes:

payload_timeliness_vote={},
payload_data_availability_vote={},

So Lodestar should stop force-seeding the anchor block's PTC votes to all-true in ProtoArray.initialize() — anchor initialization returns to the default onBlock() behavior.

This PR removes the temporary 8-line override.

Tag vs. master

`v1.7.0-alpha.5` (current spec-test target) still carries the old anchor all-true seed — #5135 landed on spec master after the alpha.5 cut. Aligning Lodestar with master now means:

• the fix is in place for the next spec tag (alpha.6+) picking up Release v1.4.3 #5135
• fork-choice spec tests generated from alpha.5 may flag the anchor-seed boundary until spec-tests-version.json bumps to that next tag

Per direction from @nflaig to follow latest master of the spec.

Context

• Supersedes closed PR fix: revert anchor block PTC vote override #9244 (closed when alpha.5 was still the current tag and kept the old seed).
• Fixes Revert PR #9188 (anchor block PTC votes to all-true) once consensus-specs gloas get_forkchoice_store bug is fixed #9239.

AI assistance

Drafted and validated with AI assistance.

[gemini-code-assist]

Code Review

This pull request removes the logic that explicitly sets the payload timeliness committee (PTC) votes to all-true for the anchor block in the ProtoArray class. I have no feedback to provide.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.53%. Comparing base (6b7eebb) to head (bb1be2e).
⚠️ Report is 2 commits behind head on unstable.

Additional details and impacted files

@@            Coverage Diff            @@
##           unstable    #9264   +/-   ##
=========================================
  Coverage     52.53%   52.53%           
=========================================
  Files           848      848           
  Lines         61311    61311           
  Branches       4510     4510           
=========================================
  Hits          32207    32207           
  Misses        29039    29039           
  Partials         65       65           

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