ci: fix filter for benchmark pushes on branch

[scottgerring]

Changes

Something wasn't quite write with the filter for the branch runs; simplifying it into a single line seems to do the trick.
Have tested with and without label and validated it fires and doesn't fire accordingly.

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[scottgerring]

@cijothomas sorry about that! The previous PR seems to trigger for branches regardless of label. This slight reformatting of the condition into a single line addresses that.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.4%. Comparing base (5be79c7) to head (f09bbc4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2834   +/-   ##
=====================================
  Coverage   80.4%   80.4%           
=====================================
  Files        124     124           
  Lines      23390   23390           
=====================================
+ Hits       18824   18828    +4     
+ Misses      4566    4562    -4     

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