fix: psql connect error

[daviderli614]

gtctl version:

GitCommit: 61684d90d7ceb873f51fb50d3b8a0bc1471da69d
GitVersion: 
GoVersion: go1.19
Compiler: gc
Platform: darwin/arm64
BuildDate: 2023-10-09T09:52:58Z

psql connect:

psql -h 127.0.0.1 -p 4003
psql: error: connection to server at "127.0.0.1", port 4003 failed: FATAL:  Database not found: greptime

link: https://docs.greptime.com/getting-started/try-out-greptimedb#connect . need to add -d public

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (61684d9) 35.36% compared to head (1cc8891) 35.36%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #164   +/-   ##
========================================
  Coverage    35.36%   35.36%           
========================================
  Files           11       11           
  Lines         1377     1377           
========================================
  Hits           487      487           
  Misses         793      793           
  Partials        97       97           

Files	Coverage Δ
pkg/cmd/gtctl/cluster/create/create.go	0.00% <0.00%> (ø)

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