tests: fix top online warning in TestAcctUpdatesCachesInitialization

[algorandskiy]

Summary

TestAcctUpdatesCachesInitialization generates online/offline deltas and sets VoteLastValid=1000.
Since the tests goes beyond 1000 rounds, most of the accounts became expired for stateproof and TopOnlineAccounts renders a warning.

Test Plan

This is a test

[id-ms]

LGTM

[codecov]

Codecov Report

Merging #4451 (4853866) into master (924d2fb) will increase coverage by 3.72%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4451      +/-   ##
==========================================
+ Coverage   51.51%   55.23%   +3.72%     
==========================================
  Files         398      398              
  Lines       50165    50165              
==========================================
+ Hits        25841    27710    +1869     
+ Misses      21934    20144    -1790     
+ Partials     2390     2311      -79     

Impacted Files	Coverage Δ
cmd/algoh/blockWatcher.go	77.77% <0.00%> (-3.18%)	⬇️
network/wsNetwork.go	64.82% <0.00%> (+0.28%)	⬆️
network/requestTracker.go	71.12% <0.00%> (+0.43%)	⬆️
ledger/internal/prefetcher/prefetcher.go	68.18% <0.00%> (+0.45%)	⬆️
node/node.go	4.43% <0.00%> (+0.47%)	⬆️
daemon/algod/api/server/v2/dryrun.go	70.82% <0.00%> (+0.60%)	⬆️
agreement/pseudonode.go	70.07% <0.00%> (+0.72%)	⬆️
ledger/catchpointwriter.go	57.65% <0.00%> (+0.90%)	⬆️
ledger/acctonline.go	78.36% <0.00%> (+1.05%)	⬆️
crypto/merkletrie/cache.go	89.02% <0.00%> (+1.18%)	⬆️
... and 111 more

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