Flip keysend feature bit on

[alecchendev]

Keysend seems to be the only feature bit that's in the node context and not the init context, so whenever we switched to providing the default init feature bits as our node feature bits, we must've left out keysend!

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5cddf5e) 90.33% compared to head (7ee90a5) 90.34%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2465   +/-   ##
=======================================
  Coverage   90.33%   90.34%           
=======================================
  Files         106      106           
  Lines       55732    55734    +2     
  Branches    55732    55734    +2     
=======================================
+ Hits        50347    50351    +4     
+ Misses       5385     5383    -2     

Files Changed	Coverage Δ
lightning/src/ln/channelmanager.rs	85.71% <100.00%> (+<0.01%)	⬆️

... and 2 files with indirect coverage changes

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