Fix StakeRegistration deser

[cffls]

Fixed #379

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.30%. Comparing base (8a44f92) to head (a59e4d1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #380      +/-   ##
==========================================
+ Coverage   85.22%   85.30%   +0.07%     
==========================================
  Files          32       32              
  Lines        4211     4213       +2     
  Branches     1059     1060       +1     
==========================================
+ Hits         3589     3594       +5     
+ Misses        435      434       -1     
+ Partials      187      185       -2     

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