Fix stable clippy string repeat lint

[joostjager]

Uncaught by broken CI

[ldk-reviews-bot]

I've assigned @valentinewallace as a reviewer!
I'll wait for their review and will help manage the review process.
Once they submit their review, I'll check if a second reviewer would be helpful.

[ldk-claude-review-bot]

This is a re-review. I already analyzed this PR in a prior pass and found no issues. The change is trivial and behavior-preserving. No new changes to review.

No issues found.

[ldk-reviews-bot]

🔔 1st Reminder

Hey @valentinewallace! This PR has been waiting for your review.
Please take a look when you have a chance. If you're unable to review, please let us know so we can find another reviewer.

[valentinewallace]

Care to re-push with no updates just so CI runs?

[ldk-reviews-bot]

👋 The first review has been submitted!

Do you think this PR is ready for a second reviewer? If so, click here to assign a second reviewer.

[joostjager]

Re-pushed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.90%. Comparing base (b6f3ad7) to head (999ab2d).
⚠️ Report is 3215 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4727      +/-   ##
==========================================
+ Coverage   84.54%   86.90%   +2.35%     
==========================================
  Files         137      161      +24     
  Lines       77617   111687   +34070     
  Branches    77617   111687   +34070     
==========================================
+ Hits        65625    97060   +31435     
- Misses       9949    12119    +2170     
- Partials     2043     2508     +465     

Flag	Coverage Δ
fuzzing-fake-hashes	7.77% <ø> (?)
fuzzing-real-hashes	29.82% <ø> (?)
tests	86.24% <100.00%> (?)

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[joostjager]

Lint passes with CI enabled