ledger: fix TestCatchpointReadDatabaseOverflowSingleAccount

[ghost]

Summary

Fixed the TestCatchpointReadDatabaseOverflowSingleAccount test. It was failing due to the same reason as the TestCatchpointReadDatabaseOverflowAccounts test. The fix is exactly the same as #4480.

Test Plan

This is a test.

[codecov]

Codecov Report

Merging #4579 (baad408) into master (42b9533) will increase coverage by 0.29%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4579      +/-   ##
==========================================
+ Coverage   53.86%   54.15%   +0.29%     
==========================================
  Files         401      401              
  Lines       51642    51642              
==========================================
+ Hits        27817    27967     +150     
+ Misses      21456    21328     -128     
+ Partials     2369     2347      -22     

Impacted Files	Coverage Δ
ledger/tracker.go	74.89% <0.00%> (ø)
network/wsNetwork.go	64.63% <0.00%> (ø)
data/transactions/logic/assembler.go	85.96% <0.00%> (+0.14%)	⬆️
ledger/accountdb.go	73.03% <0.00%> (+0.15%)	⬆️
data/transactions/logic/eval.go	89.31% <0.00%> (+0.42%)	⬆️
ledger/acctupdates.go	69.59% <0.00%> (+0.44%)	⬆️
data/account/participationRegistry.go	78.50% <0.00%> (+0.48%)	⬆️
cmd/tealdbg/cdtState.go	85.15% <0.00%> (+0.51%)	⬆️
ledger/acctonline.go	78.64% <0.00%> (+0.52%)	⬆️
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
... and 22 more

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