refactor(livechat): Solve lint warnings

[tassoevan]

Proposed changes (including videos or screenshots)

It fixes lint warnings in @rocket.chat/livechat.

Issue(s)

Further comments

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.07%. Comparing base (3d0b533) to head (86436db).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #39338      +/-   ##
===========================================
- Coverage    70.08%   70.07%   -0.01%     
===========================================
  Files         3301     3301              
  Lines       120778   120778              
  Branches     21594    21582      -12     
===========================================
- Hits         84642    84636       -6     
- Misses       32853    32856       +3     
- Partials      3283     3286       +3     

Flag	Coverage Δ
unit	70.90% <ø> (-0.01%)	⬇️

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