interop: fix CreateMultisigAccount interop

[AnnaShaleva]

Introduced in #1720.

Close #1803.

[codecov]

Codecov Report

Merging #1804 (52e4d69) into master (4a9ca25) will increase coverage by 0.27%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1804      +/-   ##
==========================================
+ Coverage   83.56%   83.83%   +0.27%     
==========================================
  Files         271      271              
  Lines       22052    22396     +344     
==========================================
+ Hits        18427    18775     +348     
+ Misses       2500     2479      -21     
- Partials     1125     1142      +17     

Impacted Files	Coverage Δ
pkg/interop/contract/contract.go	0.00% <0.00%> (ø)
cli/smartcontract/smart_contract.go	90.39% <0.00%> (+2.67%)	⬆️
pkg/rpc/client/rpc.go	86.69% <0.00%> (+3.01%)	⬆️
pkg/services/oracle/request.go	62.29% <0.00%> (+4.91%)	⬆️
pkg/rpc/client/nep17.go	56.83% <0.00%> (+8.11%)	⬆️
cli/wallet/validator.go	81.17% <0.00%> (+9.30%)	⬆️
pkg/services/oracle/oracle.go	90.58% <0.00%> (+11.76%)	⬆️

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