interop: fix ConvertContextToReadOnly interop

[AnnaShaleva]

The same bug as in #1804.

Also checked the rest of interops, they're OK. Maybe we need some test for such bugs.

[codecov]

Codecov Report

Merging #1805 (0c46408) into master (0e7bb5c) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1805   +/-   ##
=======================================
  Coverage   83.57%   83.58%           
=======================================
  Files         271      271           
  Lines       22077    22077           
=======================================
+ Hits        18451    18452    +1     
+ Misses       2500     2499    -1     
  Partials     1126     1126           

Impacted Files	Coverage Δ
pkg/interop/storage/storage.go	0.00% <0.00%> (ø)
pkg/network/server.go	72.76% <0.00%> (-0.16%)	⬇️
pkg/services/oracle/request.go	57.37% <0.00%> (+1.63%)	⬆️

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