Fixes storage alive size with secondary indexes

[brooksprumo]

Problem

When generating the index with secondary indexes, the AccountStorageEntry's alive bytes is incorrectly set (approximately double). This likely causes issues later, e.g. not shrinking when they should.

Summary of Changes

Fix it.

Note, I intend to backport this fix to v2.2.

[brooksprumo]

Here's the bug. We've already incremented the stored_size_alive for this storage (above). So doing it again here is wrong.

[mergify]

Backports to the beta branch are to be avoided unless absolutely necessary for fixing bugs, security issues, and perf regressions. Changes intended for backport should be structured such that a minimum effective diff can be committed separately from any refactoring, plumbing, cleanup, etc that are not strictly necessary to achieve the goal. Any of the latter should go only into master and ride the normal stabilization schedule. Exceptions include CI/metrics changes, CLI improvements and documentation updates on a case by case basis.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.0%. Comparing base (09f105e) to head (afd7ab6).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5778   +/-   ##
=======================================
  Coverage    82.9%    83.0%           
=======================================
  Files         826      826           
  Lines      375758   375778   +20     
=======================================
+ Hits       311829   311914   +85     
+ Misses      63929    63864   -65     

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[HaoranYi]

lgtm.

Maybe it is worth to add an assert of alive_bytes <= account_file.len().

[brooksprumo]

Maybe it is worth to add an assert of alive_bytes <= account_file.len().

Yeah, seems like a reasonable thing to add.