refactor(api-sync): calculate initial supply during restore from account balances

[oXtxNt9U]

Summary

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Project coverage is 50.42%. Comparing base (4de3046) to head (444a94f).
Report is 12 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/api-sync/source/restore.ts	0.00%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #973      +/-   ##
===========================================
+ Coverage    50.25%   50.42%   +0.17%     
===========================================
  Files         1112     1112              
  Lines        60076    60138      +62     
  Branches      1458     1467       +9     
===========================================
+ Hits         30190    30325     +135     
+ Misses       29848    29775      -73     
  Partials        38       38              

Flag	Coverage Δ
contracts	99.48% <ø> (ø)
packages	50.10% <0.00%> (+0.17%)	⬆️

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