chore: fix the output of etcdctl watch -i

[JalinWang]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

Although the interactive mode of etcdctl watch supports progress command now, the output is a little bit out-of-date :(

[k8s-ci-robot]

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This pull-request has been approved by: JalinWang
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[k8s-ci-robot]

Hi @JalinWang. Thanks for your PR.

I'm waiting for a etcd-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 68.88%. Comparing base (fefce54) to head (76065c1).

Files with missing lines	Patch %	Lines
etcdctl/ctlv3/command/watch_command.go	0.00%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
etcdctl/ctlv3/command/watch_command.go	44.08% <0.00%> (ø)

... and 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19397      +/-   ##
==========================================
- Coverage   68.94%   68.88%   -0.06%     
==========================================
  Files         420      420              
  Lines       35759    35764       +5     
==========================================
- Hits        24654    24637      -17     
- Misses       9684     9705      +21     
- Partials     1421     1422       +1     

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