Testing: Fix voterTracker tests

[id-ms]

Summary

The unit tests for the voterTracker didn't correctly calculate the account's total stake. This lead to an error message on logs.

Test Plan

[codecov]

Codecov Report

Merging #4441 (a821498) into master (7932403) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4441      +/-   ##
==========================================
+ Coverage   55.21%   55.23%   +0.01%     
==========================================
  Files         398      398              
  Lines       50165    50165              
==========================================
+ Hits        27701    27709       +8     
+ Misses      20153    20147       -6     
+ Partials     2311     2309       -2     

Impacted Files	Coverage Δ
ledger/blockqueue.go	85.63% <0.00%> (-2.88%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
ledger/acctonline.go	78.89% <0.00%> (-0.53%)	⬇️
catchup/service.go	68.88% <0.00%> (-0.50%)	⬇️
network/wsNetwork.go	64.63% <0.00%> (-0.29%)	⬇️
ledger/accountdb.go	72.74% <0.00%> (+0.07%)	⬆️
ledger/tracker.go	75.64% <0.00%> (+0.85%)	⬆️
network/wsPeer.go	67.67% <0.00%> (+2.19%)	⬆️
util/db/dbutil.go	48.48% <0.00%> (+4.24%)	⬆️
ledger/roundlru.go	96.22% <0.00%> (+5.66%)	⬆️

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