[Flow EVM] patch the gas refund value that is returned to users

[ramtinms]

There is a difference between the gas refund that is accumulated and one that is reported.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.50%. Comparing base (8b4fff2) to head (11ffd8d).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6387      +/-   ##
==========================================
- Coverage   41.50%   41.50%   -0.01%     
==========================================
  Files        2013     2013              
  Lines      143520   143520              
==========================================
- Hits        59573    59564       -9     
- Misses      77768    77777       +9     
  Partials     6179     6179              

Flag	Coverage Δ
unittests	41.50% <100.00%> (-0.01%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.