Test value inserted for preallocated entry instead of cloned value

[kskalski]

Problem

accounts-index test implements a custom Clone for PreAllocatedAccountMapEntry that is only used for checking first (slot, val) stored in there before inserting to accounts-index map.

Summary of Changes

Make the test actually check the inserted values, not how the values are converted from pre-alloc entry cloned by test-only code.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.2%. Comparing base (7b4f131) to head (3137fd2).

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #8337     +/-   ##
=========================================
- Coverage    83.2%    83.2%   -0.1%     
=========================================
  Files         836      836             
  Lines      367890   367880     -10     
=========================================
- Hits       306231   306216     -15     
- Misses      61659    61664      +5     

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[brooksprumo]