Remove simple outer arcs

[valentinewallace]

This isn't strictly necessary but it made the sample a bit nicer

[codecov]

Codecov Report

Merging #816 (ce505fa) into main (e77b160) will decrease coverage by 0.31%.
The diff coverage is 73.07%.

@@            Coverage Diff             @@
##             main     #816      +/-   ##
==========================================
- Coverage   91.04%   90.73%   -0.32%     
==========================================
  Files          48       48              
  Lines       25480    25642     +162     
==========================================
+ Hits        23199    23266      +67     
- Misses       2281     2376      +95     

Impacted Files	Coverage Δ
lightning-block-sync/src/init.rs	93.56% <ø> (ø)
lightning-net-tokio/src/lib.rs	76.70% <ø> (ø)
lightning/src/ln/peer_handler.rs	44.82% <0.00%> (-4.90%)	⬇️
lightning/src/util/macro_logger.rs	88.33% <ø> (ø)
lightning/src/util/ser.rs	90.90% <0.00%> (+0.29%)	⬆️
lightning/src/chain/keysinterface.rs	93.15% <90.00%> (-0.21%)	⬇️
lightning-persister/src/lib.rs	92.52% <92.30%> (+0.29%)	⬆️
lightning/src/chain/channelmonitor.rs	95.52% <94.81%> (-0.16%)	⬇️
lightning-persister/src/util.rs	95.77% <100.00%> (-0.06%)	⬇️
lightning/src/chain/chainmonitor.rs	94.20% <100.00%> (+0.08%)	⬆️
... and 11 more

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[ariard]

Code Review ACK a2d9fca