fix closer assignment

[udpatil]

Describe your changes and provide context

This properly assigns closers when adding them so that scStore is properly closed after statesync snapshot.

Testing performed to validate your change

Verified on statesyncer node in arctic-1

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 54.83%. Comparing base (f364e37) to head (de6f159).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
store/cachemulti/store.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #536   +/-   ##
=======================================
  Coverage   54.83%   54.83%           
=======================================
  Files         631      631           
  Lines       54807    54807           
=======================================
+ Hits        30052    30055    +3     
+ Misses      22603    22601    -2     
+ Partials     2152     2151    -1     

Files with missing lines	Coverage Δ
store/cachemulti/store.go	6.83% <0.00%> (ø)

... and 1 file with indirect coverage changes