Use the actual type, not the associated type, in trait impls

[TheBlueMatt]

This is equivalent and just easier for the bindings to deal with (though, really, they should handle it).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.81%. Comparing base (49dfa5a) to head (5359ceb).
Report is 4 commits behind head on main.

Files	Patch %	Lines
lightning/src/ln/peer_handler.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3269      +/-   ##
==========================================
+ Coverage   89.79%   89.81%   +0.01%     
==========================================
  Files         125      126       +1     
  Lines      102810   103299     +489     
  Branches   102810   103299     +489     
==========================================
+ Hits        92322    92776     +454     
- Misses       7768     7805      +37     
+ Partials     2720     2718       -2     

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