Remove redundant field names

[gcomte]

Very simple refactoring, purging redundant field names

[codecov-commenter]

Codecov Report

Base: 90.78% // Head: 90.76% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (8abf02c) compared to base (fdfd4f0).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1765      +/-   ##
==========================================
- Coverage   90.78%   90.76%   -0.03%     
==========================================
  Files          87       87              
  Lines       46969    46969              
  Branches    46969    46969              
==========================================
- Hits        42643    42633      -10     
- Misses       4326     4336      +10     

Impacted Files	Coverage Δ
lightning/src/chain/channelmonitor.rs	91.21% <ø> (ø)
lightning/src/routing/router.rs	91.62% <ø> (ø)
lightning/src/ln/channelmanager.rs	85.16% <100.00%> (ø)
lightning/src/ln/functional_test_utils.rs	93.44% <100.00%> (ø)
lightning/src/chain/onchaintx.rs	94.71% <0.00%> (-0.92%)	⬇️
lightning/src/ln/monitor_tests.rs	99.44% <0.00%> (-0.12%)	⬇️
lightning/src/ln/functional_tests.rs	96.87% <0.00%> (-0.08%)	⬇️

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