Strip witness of interactive tx parents

[pm47]

Equivalent to ACINQ/lightning-kmp#542.

[codecov-commenter]

Codecov Report

Merging #2755 (7fbfd45) into master (e3ba524) will increase coverage by 0.06%.
Report is 3 commits behind head on master.
The diff coverage is 100.00%.

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@@            Coverage Diff             @@
##           master    #2755      +/-   ##
==========================================
+ Coverage   85.75%   85.82%   +0.06%     
==========================================
  Files         216      216              
  Lines       18061    18071      +10     
  Branches      743      765      +22     
==========================================
+ Hits        15488    15509      +21     
+ Misses       2573     2562      -11     

Files	Coverage Δ
...re/src/main/scala/fr/acinq/eclair/NodeParams.scala	93.37% <100.00%> (+0.04%)	⬆️
...r/acinq/eclair/blockchain/fee/OnChainFeeConf.scala	95.00% <ø> (-0.24%)	⬇️
...cala/fr/acinq/eclair/channel/ChannelFeatures.scala	100.00% <100.00%> (ø)
...in/scala/fr/acinq/eclair/channel/Commitments.scala	96.82% <100.00%> (+<0.01%)	⬆️
...c/main/scala/fr/acinq/eclair/channel/Helpers.scala	94.51% <100.00%> (+0.02%)	⬆️
...in/scala/fr/acinq/eclair/channel/fsm/Channel.scala	85.92% <100.00%> (+0.62%)	⬆️
...q/eclair/channel/fsm/ChannelOpenSingleFunded.scala	93.46% <100.00%> (ø)
...inq/eclair/channel/fund/InteractiveTxBuilder.scala	91.47% <100.00%> (+0.10%)	⬆️
...cinq/eclair/channel/fund/InteractiveTxFunder.scala	92.24% <100.00%> (+0.06%)	⬆️
...-core/src/main/scala/fr/acinq/eclair/io/Peer.scala	87.60% <100.00%> (ø)
... and 2 more

... and 5 files with indirect coverage changes