Catchpoint: Fix broken merge between #4818 and #4835

[michaeldiamant]

Fixes broken merge between #4818 and #4835.

Prior to the PR, master fails compilation with: ledger/catchpointwriter_test.go:585:22: undefined: MakeMerkleCommitter.

[codecov]

Codecov Report

Merging #4840 (e8af397) into master (8327fc7) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4840      +/-   ##
==========================================
+ Coverage   53.52%   53.56%   +0.03%     
==========================================
  Files         422      422              
  Lines       53852    53852              
==========================================
+ Hits        28826    28845      +19     
+ Misses      22704    22685      -19     
  Partials     2322     2322              

Impacted Files	Coverage Δ
ledger/accountdb.go	68.51% <ø> (ø)
network/wsPeer.go	67.06% <0.00%> (-2.39%)	⬇️
catchup/service.go	68.71% <0.00%> (-0.74%)	⬇️
ledger/testing/randomAccounts.go	56.61% <0.00%> (-0.62%)	⬇️
ledger/acctupdates.go	69.34% <0.00%> (-0.25%)	⬇️
network/wsNetwork.go	64.92% <0.00%> (+0.17%)	⬆️
ledger/catchpointtracker.go	59.83% <0.00%> (+0.47%)	⬆️
ledger/acctonline.go	78.81% <0.00%> (+0.51%)	⬆️
cmd/tealdbg/debugger.go	73.49% <0.00%> (+0.80%)	⬆️
crypto/merkletrie/node.go	93.48% <0.00%> (+1.86%)	⬆️
... and 4 more

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