server: use fast for funding tx fee estimate

lucarequested to merge
change-round-tx-fee into master
  • check or remove this line after you've added a CHANGELOG entry or if your PR doesn't need one (they should go into CHANGELOG/unreleased/)

Summary by CodeRabbit

  • Bug Fixes
    • Improved funding transaction processing by using a faster fee rate, which may help transactions confirm more quickly and reliably.
Edited by luca

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