fix: correct unset_maintenance_mode behavior

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

correct unset_maintenance_mode behavior

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.76%. Comparing base (485782a) to head (bcc34c0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5009      +/-   ##
==========================================
- Coverage   83.99%   83.76%   -0.23%     
==========================================
  Files        1147     1147              
  Lines      214040   214053      +13     
==========================================
- Hits       179778   179302     -476     
- Misses      34262    34751     +489     

[fengjiachun]

LGTM