Model gas logic fix

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #679 into master will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #679      +/-   ##
==========================================
- Coverage   50.82%   50.80%   -0.03%     
==========================================
  Files         408      408              
  Lines       51943    51943              
==========================================
- Hits        26402    26390      -12     
- Misses      23511    23522      +11     
- Partials     2030     2031       +1     

Impacted Files	Coverage Δ
core/state_transition.go	49.35% <0.00%> (ø)
trie/sync_bloom.go	60.52% <0.00%> (-5.27%)	⬇️
p2p/rlpx.go	69.40% <0.00%> (-3.12%)	⬇️
trie/proof.go	74.62% <0.00%> (-1.50%)	⬇️
core/tx_pool.go	75.66% <0.00%> (-0.94%)	⬇️
p2p/simulations/mocker.go	34.54% <0.00%> (-0.91%)	⬇️
trie/trie.go	83.40% <0.00%> (-0.86%)	⬇️
p2p/simulations/http.go	69.56% <0.00%> (-0.55%)	⬇️
p2p/discover/v5_udp.go	72.85% <0.00%> (-0.47%)	⬇️
p2p/server.go	66.98% <0.00%> (ø)
... and 4 more