Update PostgresStorageAdapter.js

[vitaly-t]

refactoring method + removing a comment that's no longer needed.

[codecov]

Codecov Report

Merging #3870 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3870      +/-   ##
==========================================
+ Coverage   90.14%   90.15%   +0.01%     
==========================================
  Files         114      114              
  Lines        7550     7550              
==========================================
+ Hits         6806     6807       +1     
+ Misses        744      743       -1

Impacted Files	Coverage Δ
...dapters/Storage/Postgres/PostgresStorageAdapter.js	95.32% <100%> (-0.14%)	⬇️
src/RestWrite.js	93.26% <0%> (+0.39%)	⬆️

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[flovilmart]

Thanks!