Ledger: Initialize the accountUpdatesLedgerEvaluator properly

[jannotti]

This fixes the purestake issue on betanet and includes an easy way to test for similar bugs.

[codecov]

Codecov Report

Merging #4456 (43adafb) into master (87867c9) will decrease coverage by 0.02%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##           master    #4456      +/-   ##
==========================================
- Coverage   55.26%   55.24%   -0.03%     
==========================================
  Files         398      398              
  Lines       50263    50265       +2     
==========================================
- Hits        27780    27771       -9     
- Misses      20167    20176       +9     
- Partials     2316     2318       +2     

Impacted Files	Coverage Δ
ledger/ledger.go	66.34% <0.00%> (-0.22%)	⬇️
ledger/tracker.go	74.89% <100.00%> (+0.96%)	⬆️
util/db/dbutil.go	44.24% <0.00%> (-4.25%)	⬇️
network/wsPeer.go	65.47% <0.00%> (-2.20%)	⬇️
cmd/tealdbg/debugger.go	72.69% <0.00%> (-0.81%)	⬇️
network/wsNetwork.go	64.82% <0.00%> (+0.19%)	⬆️
catchup/service.go	70.12% <0.00%> (+0.74%)	⬆️

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