refactor(core-state): test every wallet vote balance

[rainydio]

Summary

Tests are now comparing results of two functions to check vote balances:

• getExpectedVoteBalances that returns calculated vote balance values.
• getActualVoteBalances that returns actual delegate.voteBalance values.

Checklist

• Tests
• Ready to be merged

[codecov-io]

Codecov Report

Merging #4285 (793d861) into develop (010592c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #4285   +/-   ##
========================================
  Coverage    94.69%   94.69%           
========================================
  Files          729      729           
  Lines        18013    18013           
  Branches      2207     2207           
========================================
  Hits         17058    17058           
  Misses         764      764           
  Partials       191      191           

Flag	Coverage Δ
integration	9.68% <ø> (ø)
unit	94.61% <ø> (ø)

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