Merge JoinMarket-Org/joinmarket-clientserver#1040: use btc.amount_to_str for potentially earned

d7d2de3f7c use btc.amount_to_str for potentially earned (unofficial bisq contributor)

Pull request description:

  Example result:
  `[INFO]  potentially earned = 0.00000123 BTC (123 sat)`

ACKs for top commit:
  kristapsk:
    utACK d7d2de3f7c

Tree-SHA512: 618ff01a295ed4596329e5ab1cf7ddb07f78b6e05b176af608e7e9a1a898222ed2ceb001699700bf338ba8dc098cca96af37d13122379a27ae8ec11a3a1042fb

jmclient/jmclient/maker.py

@@ -215,7 +215,7 @@ class Maker(object):
         my_total_in = sum([va['value'] for va in utxos.values()])
         real_cjfee = calc_cj_fee(ordertype, cjfee, amount)
         expected_change_value = (my_total_in - amount - txfee + real_cjfee)
-        jlog.info('potentially earned = {}'.format(real_cjfee - txfee))
+        jlog.info('potentially earned = {}'.format(btc.amount_to_str(real_cjfee - txfee)))
         jlog.info('mycjaddr, mychange = {}, {}'.format(cjaddr, changeaddr))
 
         #The remaining checks are needed to ensure