refactor(consensus): keep registration fee stored after resignation

[oXtxNt9U]

Summary

Keep fee value stored after resignation.

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 50.41%. Comparing base (4de3046) to head (5df436c).
Report is 25 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #989      +/-   ##
===========================================
+ Coverage    50.25%   50.41%   +0.16%     
===========================================
  Files         1112     1109       -3     
  Lines        60076    60089      +13     
  Branches      1458     1466       +8     
===========================================
+ Hits         30190    30296     +106     
+ Misses       29848    29756      -92     
+ Partials        38       37       -1     

Flag	Coverage Δ
contracts	98.62% <100.00%> (-0.87%)	⬇️
packages	50.06% <ø> (+0.13%)	⬆️

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