fix(language-client): correct unregister

[fannheyward]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.97%. Comparing base (b06ec93) to head (bdff14c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5482      +/-   ##
==========================================
- Coverage   97.97%   97.97%   -0.01%     
==========================================
  Files         280      280              
  Lines       27867    27867              
  Branches     5769     5769              
==========================================
- Hits        27304    27302       -2     
+ Misses        104      103       -1     
- Partials      459      462       +3     

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