Revert "ledger: increase locks granularity in lookupWithoutRewards"

[algorandskiy]

Reverts #5527 because it causes TestAcctUpdatesUpdatesCorrectness failures. Need to investigate.

[algonautshant]

Are you certain that the problem is in here and not in TestAcctUpdatesUpdatesCorrectness?

[codecov]

Codecov Report

Merging #5620 (272fc41) into master (fd15f4e) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5620      +/-   ##
==========================================
+ Coverage   54.99%   55.01%   +0.02%     
==========================================
  Files         463      463              
  Lines       64522    64515       -7     
==========================================
+ Hits        35486    35496      +10     
+ Misses      26657    26646      -11     
+ Partials     2379     2373       -6     

Files Changed	Coverage Δ
ledger/acctupdates.go	70.80% <100.00%> (-0.23%)	⬇️

... and 8 files with indirect coverage changes

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[algorandskiy]

I'd rather revert and research outside of master branch.

Failure example

   acctupdates_test.go:872: 
        	Error Trace:	/opt/cibuild/project/ledger/acctupdates_test.go:872
        	Error:      	Not equal: 
        	            	expected: 0x5f5e100
        	            	actual  : 0x5f5e097
        	Test:       	TestAcctUpdatesUpdatesCorrectness/test_with_lru_cache/DiskDB
        	Messages:   	Account index : 3
        	            	Round number : 27

So it looks like lookup from from a previous round or something, and it could be a test issue.