lnwatcher improvements

- only try sweeping csv-locked to_local if past timelock
- check if outputs are already spent
- no need to keep watching channels for which all outputs are spent and mined deep

electrum/address_synchronizer.py

@@ -355,7 +355,6 @@ class AddressSynchronizer(Logger):
         # Store fees
         self.db.update_tx_fees(tx_fees)
 
-
     @profiler
     def load_local_history(self):
         self._history_local = {}  # address -> set(txid)