Update for compatibility with the new changes of flow-go

[ramtinms]

This PR updates the emulator code to work with the changes on the FVM side of flow-go

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c05f6d2) 54.96% compared to head (9a53e65) 54.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #505      +/-   ##
==========================================
- Coverage   54.96%   54.00%   -0.96%     
==========================================
  Files          28       29       +1     
  Lines        3648     3705      +57     
==========================================
- Hits         2005     2001       -4     
- Misses       1482     1542      +60     
- Partials      161      162       +1     

Flag	Coverage Δ
unittests	54.00% <100.00%> (-0.96%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
emulator/blockchain.go	72.51% <100.00%> (ø)

... and 2 files with indirect coverage changes

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