Fix minor nits in BumpTransactionEventHandler

[tnull]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 89.83%. Comparing base (1237abf) to head (8e08eaf).
Report is 4 commits behind head on main.

Files	Patch %	Lines
lightning/src/events/bump_transaction.rs	60.00%	0 Missing and 2 partials ⚠️

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Additional details and impacted files

@@           Coverage Diff            @@
##             main    #3073    +/-   ##
========================================
  Coverage   89.83%   89.83%            
========================================
  Files         116      116            
  Lines       96466    96833   +367     
  Branches    96466    96833   +367     
========================================
+ Hits        86656    86992   +336     
- Misses       7263     7290    +27     
- Partials     2547     2551     +4     

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