runtime-sdk/modules/contracts: Propagate readonly flag

[peternose]

No description provided.

[netlify]

✅ Deploy Preview for oasisprotocol-oasis-sdk canceled.

Name	Link
🔨 Latest commit	c3d65e2
🔍 Latest deploy log	https://app.netlify.com/projects/oasisprotocol-oasis-sdk/deploys/6a7ee46f5365e0000824ba40

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 51.42%. Comparing base (e37ade7) to head (c3d65e2).

Files with missing lines	Patch %	Lines
runtime-sdk/modules/contracts/src/results.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2496      +/-   ##
==========================================
- Coverage   51.43%   51.42%   -0.01%     
==========================================
  Files         237      237              
  Lines       17241    17241              
==========================================
- Hits         8868     8867       -1     
- Misses       8313     8314       +1     
  Partials       60       60              

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