runtime-sdk/modules/rofl-market: Decrement instances count on cancel

[peternose]

No description provided.

[netlify]

✅ Deploy Preview for oasisprotocol-oasis-sdk canceled.

Name	Link
🔨 Latest commit	4aa316f
🔍 Latest deploy log	https://app.netlify.com/projects/oasisprotocol-oasis-sdk/deploys/69a2d75f883b630008d5a1ed

[codecov]

Codecov Report

❌ Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.65%. Comparing base (eb8e61e) to head (4aa316f).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
runtime-sdk/modules/rofl-market/src/lib.rs	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2436      +/-   ##
==========================================
+ Coverage   48.64%   48.65%   +0.01%     
==========================================
  Files         224      224              
  Lines       16104    16110       +6     
==========================================
+ Hits         7834     7839       +5     
- Misses       8210     8211       +1     
  Partials       60       60              

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