object: fix with prefix

[zhijian-pro]

Storage of type whithprfix should behave in the same way as the storage it wraps.

[codecov-commenter]

Codecov Report

Merging #2021 (50b3e1c) into main (c361878) will increase coverage by 0.11%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #2021      +/-   ##
==========================================
+ Coverage   61.52%   61.63%   +0.11%     
==========================================
  Files         137      137              
  Lines       23837    23837              
==========================================
+ Hits        14665    14693      +28     
+ Misses       7452     7430      -22     
+ Partials     1720     1714       -6     

Impacted Files	Coverage Δ
pkg/object/prefix.go	69.76% <0.00%> (ø)
pkg/chunk/cached_store.go	75.68% <0.00%> (-0.55%)	⬇️
pkg/meta/redis.go	71.88% <0.00%> (+0.04%)	⬆️
pkg/meta/sql.go	65.00% <0.00%> (+0.09%)	⬆️
pkg/meta/tkv.go	76.78% <0.00%> (+0.43%)	⬆️
pkg/vfs/writer.go	79.66% <0.00%> (+1.01%)	⬆️
pkg/vfs/reader.go	80.29% <0.00%> (+3.10%)	⬆️

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