Fulfill hold times rustfmt

[joostjager]

Split off from #3801 (request in #3801 (review))

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[codecov]

Codecov Report

Attention: Patch coverage is 84.97914% with 108 lines in your changes missing coverage. Please review.

Project coverage is 89.01%. Comparing base (cfa782d) to head (90965a9).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning/src/ln/channel.rs	83.66%	67 Missing and 6 partials ⚠️
lightning/src/ln/channelmanager.rs	87.13%	33 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3937      +/-   ##
==========================================
+ Coverage   88.99%   89.01%   +0.01%     
==========================================
  Files         166      166              
  Lines      120874   121266     +392     
  Branches   120874   121266     +392     
==========================================
+ Hits       107577   107939     +362     
- Misses      10885    10923      +38     
+ Partials     2412     2404       -8     

Flag	Coverage Δ
fuzz	22.53% <38.46%> (+0.12%)	⬆️

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[tnull]

Verified that the first commit matches cargo +1.63 fmt output and reviewed the second one.

LGTM. I'll go ahead and land this once CI passes as it's trivial and @valentinewallace and @TheBlueMatt had already ACKed this over at #3801.

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