Fix missing argument in splicing test

[vincenzopalazzo]

Summary

• RecipientOnionFields::secret_only was updated to require a total_mpp_amount_msat parameter, but one call site in do_abandon_splice_quiescent_action_on_shutdown was not updated, breaking the test target compilation.

Test plan

• cargo check -p lightning --lib --tests compiles successfully
• abandon_splice_quiescent_action_on_shutdown test passes

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[jkczyz]

Let's fix this in #4388 to avoid more conflicts.

[jkczyz]

Fixed in 7e413a7

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.86%. Comparing base (df57978) to head (39f1c66).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4441      +/-   ##
==========================================
- Coverage   85.89%   85.86%   -0.04%     
==========================================
  Files         159      159              
  Lines      104402   104395       -7     
  Branches   104402   104395       -7     
==========================================
- Hits        89681    89641      -40     
- Misses      12216    12246      +30     
- Partials     2505     2508       +3     

Flag	Coverage Δ
tests	85.86% <ø> (-0.04%)	⬇️

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