cmd/sync: fix setuid setgid and sticky bits not being set when sync with the jfs protocol

[zhijian-pro]

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[codecov]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (a6907b0) 56.01% compared to head (da16262) 56.03%.

Files	Patch %	Lines
cmd/object.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4419      +/-   ##
==========================================
+ Coverage   56.01%   56.03%   +0.02%     
==========================================
  Files         154      154              
  Lines       40076    40088      +12     
==========================================
+ Hits        22447    22463      +16     
+ Misses      15120    15115       -5     
- Partials     2509     2510       +1     

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