fix: double commands output in help

[alexander-akait]

What kind of change does this PR introduce?

bugfix

Did you add tests for your changes?

yes

If relevant, did you update the documentation?

No need

Summary

fixes #2290

Does this PR introduce a breaking change?

No

Other information

No

[codecov]

Codecov Report

Merging #2298 (ad3ac79) into master (0191ebc) will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2298      +/-   ##
==========================================
+ Coverage   67.78%   67.83%   +0.05%     
==========================================
  Files          63       63              
  Lines        2483     2487       +4     
  Branches      570      572       +2     
==========================================
+ Hits         1683     1687       +4     
  Misses        800      800              

Impacted Files	Coverage Δ
packages/webpack-cli/lib/webpack-cli.js	89.59% <100.00%> (+0.06%)	⬆️

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