rbf: fix issues with bump_frr_through_decreasing_change - break from loop if target is reached - recompute delta if there is no next iteration.
rbf: fix issues with bump_frr_through_decreasing_change
- break from loop if target is reached
- recompute delta if there is no next iteration.

pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc,spesmilo/electrum,spesmilo/electrum,pooler/electrum-ltc,spesmilo/electrum,pooler/electrum-ltc