create ".minio.sys" dir even if multi-buckets are not enabled

[zhijian-pro]

No description provided.

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (e39e8ac) 55.95% compared to head (74d6f4b) 55.97%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/gateway/gateway.go	14.28%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4367      +/-   ##
==========================================
+ Coverage   55.95%   55.97%   +0.01%     
==========================================
  Files         154      154              
  Lines       39903    39904       +1     
==========================================
+ Hits        22329    22335       +6     
+ Misses      15065    15057       -8     
- Partials     2509     2512       +3     

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