fix: SSTORE2MetadataProvider indexing

[0xble]

Motivation

Solution

[height]

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[github-actions]

Gas Report:
Accept Proposal: 31749
Create party custom metadata: 726170
Create party vanilla: 296856
Contribute to ETH party: 204946
Batch contribute two memberships to ETH party: 278336
Create proposal transfer eth: 141169
Execute proposal transfer eth: 123058
Create proposal distribute: 139523
Execute proposal distribute: 232549
Claim distribution: 74905

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 70.85%. Comparing base (8522dba) to head (a7a0cb0).

Files	Patch %	Lines
contracts/renderers/SSTORE2MetadataProvider.sol	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #394      +/-   ##
==========================================
- Coverage   70.87%   70.85%   -0.03%     
==========================================
  Files          71       71              
  Lines        3114     3115       +1     
  Branches      673      674       +1     
==========================================
  Hits         2207     2207              
  Misses        702      702              
- Partials      205      206       +1     

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