core/state: use maps.Clone

[ucwong]

core: using maps.Clone

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.27%. Comparing base (905ab8f) to head (3c582b2).
Report is 46 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1965      +/-   ##
==========================================
+ Coverage   47.25%   47.27%   +0.01%     
==========================================
  Files         568      568              
  Lines       68860    68851       -9     
==========================================
+ Hits        32540    32546       +6     
+ Misses      33798    33774      -24     
- Partials     2522     2531       +9     

Files	Coverage Δ
core/state/access_list.go	91.83% <100.00%> (-0.62%)	⬇️
core/state/state_object.go	74.62% <100.00%> (-0.29%)	⬇️
core/state/statedb.go	62.34% <100.00%> (+0.21%)	⬆️

... and 18 files with indirect coverage changes