Add BOLT 3 test vector for CLTV tiebreaker

[jkczyz]

The test vector was added in lightning/bolts#539.

[codecov]

Codecov Report

Merging #771 (e58e73f) into main (9c9c881) will decrease coverage by 0.12%.
The diff coverage is 88.54%.

@@            Coverage Diff             @@
##             main     #771      +/-   ##
==========================================
- Coverage   91.35%   91.22%   -0.13%     
==========================================
  Files          37       37              
  Lines       22791    22866      +75     
==========================================
+ Hits        20821    20860      +39     
- Misses       1970     2006      +36     

Impacted Files	Coverage Δ
lightning/src/chain/keysinterface.rs	93.33% <0.00%> (-0.86%)	⬇️
lightning/src/lib.rs	100.00% <ø> (ø)
lightning/src/util/config.rs	50.00% <50.00%> (-19.05%)	⬇️
lightning/src/util/test_utils.rs	83.68% <66.66%> (-1.16%)	⬇️
lightning/src/ln/channel.rs	87.49% <86.95%> (-0.03%)	⬇️
lightning/src/chain/channelmonitor.rs	95.67% <100.00%> (+0.09%)	⬆️
lightning/src/ln/chanmon_update_fail_tests.rs	97.56% <100.00%> (ø)
lightning/src/ln/channelmanager.rs	84.94% <100.00%> (ø)
lightning/src/ln/functional_test_utils.rs	95.13% <100.00%> (ø)
lightning/src/ln/functional_tests.rs	96.91% <100.00%> (-0.27%)	⬇️
... and 3 more

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[jkczyz]

Tested by removing the tiebreaker and seeing a test failure.

[TheBlueMatt]

Why did we only take one of the new tests when it looks like the spec PR has several tests?

[jkczyz]

Why did we only take one of the new tests when it looks like the spec PR has several tests?

The spec PR only adds one new test vector. However, it was updated to include all test vectors for use with option_static_remotekey which we already moved to in babf0af.