services: fix gosimple warning

[AnnaShaleva]

Originally found by Lint GA in #2389.

Fix the following warning:

S1001: should use copy() instead of a loop (gosimple)

[codecov]

Codecov Report

Merging #2473 (48ee33f) into master (711e217) will increase coverage by 0.00%.
The diff coverage is 84.72%.

@@           Coverage Diff           @@
##           master    #2473   +/-   ##
=======================================
  Coverage   85.09%   85.10%           
=======================================
  Files         291      291           
  Lines       36780    36804   +24     
=======================================
+ Hits        31298    31321   +23     
- Misses       4170     4171    +1     
  Partials     1312     1312           

Impacted Files	Coverage Δ
cli/flags/address.go	100.00% <ø> (ø)
cli/flags/fixed8.go	100.00% <ø> (ø)
cli/input/input.go	51.21% <ø> (ø)
cli/options/options.go	90.62% <ø> (ø)
cli/paramcontext/context.go	62.50% <ø> (ø)
cli/smartcontract/generate.go	83.33% <ø> (ø)
cli/wallet/legacy.go	89.88% <ø> (ø)
cli/wallet/validator.go	74.85% <0.00%> (ø)
pkg/compiler/analysis.go	96.04% <ø> (ø)
pkg/compiler/func_scope.go	100.00% <ø> (ø)
... and 169 more

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