mobile: support exact miner fee for refund transactions and refactor swap helpers#7

shubhamkmr04 wants to merge 2 commits into

ZeusLN:lnd-v0.20.1-beta-zeus.1ZeusLN/lnd:lnd-v0.20.1-beta-zeus.1from

shubhamkmr04:swaps-updatesshubhamkmr04/lnd:swaps-updatesCopy head branch name to clipboard