fix: remove deprecated migration

migrations/1620954224627-add-fee-priority.js

@@ -1,21 +0,0 @@
-const _ = require('lodash/fp')
-const { migrationSaveConfig, loadLatest } = require('../lib/new-settings-loader')
-const { getCryptosFromWalletNamespace } = require('../lib/new-config-manager')
-
-exports.up = function (next) {
-  const newConfig = {}
-  return loadLatest()
-    .then(config => {
-      const coins = getCryptosFromWalletNamespace(config)
-      _.map(coin => { newConfig[`wallets_${coin}_feeMultiplier`] = '1' }, coins)
-      return migrationSaveConfig(newConfig)
-    })
-    .then(next)
-    .catch(err => {
-      return next(err)
-    })
-}
-
-module.exports.down = function (next) {
-  next()
-}