Change value type for reward type

[Rakambda]

Pull Request Etiquette

Checklist

• Tests have been added in relevant areas
• Corresponding changes made to the documentation (README.adoc)

Type of change

Description

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.02%. Comparing base (1f6f1d3) to head (11b0a9d).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #748      +/-   ##
=============================================
- Coverage      85.04%   85.02%   -0.03%     
+ Complexity      1060     1059       -1     
=============================================
  Files            206      205       -1     
  Lines           3371     3365       -6     
  Branches         251      251              
=============================================
- Hits            2867     2861       -6     
  Misses           448      448              
  Partials          56       56              

Flag	Coverage Δ
unittests-miner	85.40% <ø> (-0.03%)	⬇️
unittests-viewer	58.33% <ø> (ø)

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