ledger: update EvalForIndexer to avoid totals computation

[tsachiherman]

Summary

In the EvalForIndexer, we don't want to call finalValidation(). This would
skip the calculation of the account totals in the state delta, which is a serious
issue if it were to be used by algod, but it's perfectly fine for the indexer since
it doesn't track any totals and therefore cannot calculate the new totals.

Test Plan

Test against the indexer.

[codecov-commenter]

Codecov Report

Merging #2941 (48419a3) into master (e69b10d) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2941      +/-   ##
==========================================
- Coverage   47.33%   47.28%   -0.05%     
==========================================
  Files         355      355              
  Lines       57224    57220       -4     
==========================================
- Hits        27085    27055      -30     
- Misses      27079    27101      +22     
- Partials     3060     3064       +4     

Impacted Files	Coverage Δ
ledger/evalIndexer.go	39.24% <ø> (+0.68%)	⬆️
network/wsPeer.go	72.14% <0.00%> (-3.07%)	⬇️
crypto/merkletrie/trie.go	66.42% <0.00%> (-2.19%)	⬇️
crypto/merkletrie/node.go	91.62% <0.00%> (-1.87%)	⬇️
catchup/service.go	68.57% <0.00%> (-1.56%)	⬇️
catchup/peerSelector.go	98.95% <0.00%> (-1.05%)	⬇️
network/wsNetwork.go	60.90% <0.00%> (-0.19%)	⬇️
ledger/acctupdates.go	63.01% <0.00%> (-0.09%)	⬇️

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[tolikzinovyev]

Thanks!