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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.34%. Comparing base (5cddf5e) to head (7ee90a5).
⚠️ Report is 4170 commits behind head on main.

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 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.