[tools/etcd-dump-logs] Fix the usage of --start-index in etcd-dump-logs

[ahrtr]

Currently if users explicitly set --start-index=0, it will be ignored. It isn't expected, we should respect it as long as users explicitly set it.

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

[ahrtr]

@fuweid @ivanvc @jmhbnz @serathius

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.74%. Comparing base (0966b4d) to head (76f436c).
Report is 2 commits behind head on main.

Additional details and impacted files

see 24 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19082      +/-   ##
==========================================
+ Coverage   68.71%   68.74%   +0.03%     
==========================================
  Files         420      420              
  Lines       35640    35640              
==========================================
+ Hits        24489    24500      +11     
+ Misses       9723     9708      -15     
- Partials     1428     1432       +4     

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