Revert refuel (neo #2444)

[ixje]

neo-project/neo#2560

[codecov-commenter]

Codecov Report

Merging #122 (813be43) into development (48eb623) will increase coverage by 0.05%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development     #122      +/-   ##
===============================================
+ Coverage        83.24%   83.30%   +0.05%     
===============================================
  Files               87       87              
  Lines             7945     7937       -8     
===============================================
- Hits              6614     6612       -2     
+ Misses            1331     1325       -6     

Impacted Files	Coverage Δ
neo3/contracts/native/fungible.py	61.77% <ø> (+0.49%)	⬆️

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