fix: correct the property name for tcp_failures

[okaybase]

Please answer these questions before submitting a pull request, or your PR will get closed.

Why submit this pull request?

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What changes will this PR take into?

Correct the property name for tcp_failures.

Related issues

fix/resolve #2220

Checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #2221 (b1e6fc5) into master (ebf381d) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2221      +/-   ##
==========================================
- Coverage   68.13%   68.07%   -0.06%     
==========================================
  Files         127      127              
  Lines        3352     3352              
  Branches      824      824              
==========================================
- Hits         2284     2282       -2     
- Misses       1068     1070       +2     

Flag	Coverage Δ
frontend-e2e-test	68.07% <ø> (-0.06%)	⬇️

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Impacted Files	Coverage Δ
.../components/active-check/Unhealthy/TCPFailures.tsx	100.00% <ø> (ø)
web/src/helpers.tsx	70.49% <0.00%> (-3.28%)	⬇️

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