rpc: fix simulated loaded size tests

[2501babe]

Problem

#6063 changed the loaded accounts data size algorithm, and #6023 added loaded size to simulation results, but the latter used the old algorithm in tests

Summary of Changes

use the new algorithm. this fixes ci

[mergify]

If this PR represents a change to the public RPC API:

1. Make sure it includes a complementary update to rpc-client/ (example)
2. Open a follow-up PR to update the JavaScript client @solana/kit (example)

Thank you for keeping the RPC clients in sync with the server API @2501babe.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.8%. Comparing base (0c1d60d) to head (51570a7).
Report is 209 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #6412     +/-   ##
=========================================
- Coverage    82.8%    82.8%   -0.1%     
=========================================
  Files         848      848             
  Lines      379050   379513    +463     
=========================================
+ Hits       314021   314294    +273     
- Misses      65029    65219    +190     

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[tao-stones]

thanks for correcting the tests 🙇🏼‍♂️