L014 leading underscore capitalization inference fix

[j-svensmark]

Brief summary of the change made

Fixes #3780

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (d865086) compared to base (bcf8a76).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #3841   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          179       179           
  Lines        13754     13763    +9     
=========================================
+ Hits         13754     13763    +9     

Impacted Files	Coverage Δ
src/sqlfluff/rules/L010.py	100.00% <100.00%> (ø)

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