cli: make error message compatible with pd flag name (#2139)

[ti-chi-bot]

This is an automated cherry-pick of #2139

What problem does this PR solve?

close https://github.com/pingcap/ticdc/issues/1893

What is changed and how it works?

make error message compatible with pd flag name.

Check List

Tests

None

Code changes

None

Side effects

None

Related changes

• Need to cherry-pick to the release branch

Release note

• No release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• amyangfei

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[amyangfei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: d76964b

[codecov-commenter]

Codecov Report

Merging #2150 (084a38b) into release-4.0 (753073a) will decrease coverage by 0.0375%.
The diff coverage is 62.2598%.

@@                 Coverage Diff                 @@
##           release-4.0      #2150        +/-   ##
===================================================
- Coverage      53.7661%   53.7285%   -0.0376%     
===================================================
  Files              153        163        +10     
  Lines            15958      17339      +1381     
===================================================
+ Hits              8580       9316       +736     
- Misses            6475       7043       +568     
- Partials           903        980        +77     

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