native: change getCommittee/getNextBlockValidators price

[roman-khimov]

See neo-project/neo#2392, neo-project/neo#2391.

[codecov]

Codecov Report

Merging #1828 (6326094) into master (096f48c) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1828   +/-   ##
=======================================
  Coverage   83.36%   83.37%           
=======================================
  Files         281      281           
  Lines       22353    22353           
=======================================
+ Hits        18635    18636    +1     
  Misses       2576     2576           
+ Partials     1142     1141    -1     

Impacted Files	Coverage Δ
pkg/core/native/native_neo.go	72.82% <100.00%> (ø)
pkg/services/oracle/request.go	51.51% <0.00%> (-1.52%)	⬇️
pkg/network/server.go	71.36% <0.00%> (+0.14%)	⬆️
pkg/services/notary/notary.go	92.38% <0.00%> (+1.01%)	⬆️

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