Fix the command group duplication error

[georgechenchao]

---

This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines

• The PR has modified HISTORY.rst with an appropriate description of the change (see Modifying change log).

Command Guidelines

• Each command and parameter has a meaningful description.
• Each new command has a test.

(see Authoring Command Modules)

[msftclas]

@georgechenchao,
Thanks for your contribution as a Microsoft full-time employee or intern. You do not need to sign a CLA.
Thanks,
Microsoft Pull Request Bot

[codecov-io]

Codecov Report

Merging #4219 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4219   +/-   ##
=======================================
  Coverage   70.09%   70.09%           
=======================================
  Files         475      475           
  Lines       29603    29603           
  Branches     4539     4539           
=======================================
  Hits        20749    20749           
  Misses       7409     7409           
  Partials     1445     1445

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