fix: fuzz failure in system config test

[smartcontracts]

Description
Fixes a small fuzz failure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.40%. Comparing base (a1e78ba) to head (c5818f5).
⚠️ Report is 3 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #18550      +/-   ##
===========================================
+ Coverage    75.76%   80.40%   +4.64%     
===========================================
  Files          189      134      -55     
  Lines        11233     7202    -4031     
===========================================
- Hits          8511     5791    -2720     
+ Misses        2576     1411    -1165     
+ Partials       146        0     -146     

Flag	Coverage Δ
cannon-go-tests-64	?
contracts-bedrock-tests	80.40% <ø> (-0.05%)	⬇️

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see 56 files with indirect coverage changes

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