Fix mev boost issue on Lodestar

[stdevMac]

Changes:

• Add missing = sign on lodestar when setting a builder

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Other (please describe):

Testing

Requires testing

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• No

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 24.73%. Comparing base (6e485d7) to head (1413015).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #485      +/-   ##
===========================================
- Coverage    24.75%   24.73%   -0.03%     
===========================================
  Files          120      120              
  Lines        22299    22299              
===========================================
- Hits          5521     5515       -6     
- Misses       16235    16239       +4     
- Partials       543      545       +2     

Flag	Coverage Δ
unittests	24.73% <ø> (-0.03%)	⬇️

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