network triggers: 'verified' notification now includes wallet

this is a performance optimisation.

measurements using a large wallet with 11k txns:
syncing XPUB for the first time takes 10 seconds. leaving window open, and
syncing same XPUB again in new window takes 30 seconds. in third window,
it takes ~50 seconds. then ~70s. presumably scaling linearly.
this is due to the history_list.update_item call being CPU-heavy.
now all of them take 10 seconds.

electrum/address_synchronizer.py

@@ -593,7 +593,7 @@ class AddressSynchronizer(PrintError):
             self.unverified_tx.pop(tx_hash, None)
             self.verified_tx[tx_hash] = info
         tx_mined_status = self.get_tx_height(tx_hash)
-        self.network.trigger_callback('verified', tx_hash, tx_mined_status)
+        self.network.trigger_callback('verified', self, tx_hash, tx_mined_status)
 
     def get_unverified_txs(self):
         '''Returns a map from tx hash to transaction height'''

electrum/gui/qt/main_window.py

@@ -316,7 +316,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         elif event == 'banner':
             self.console.showMessage(args[0])
         elif event == 'verified':
-            self.history_list.update_item(*args)
+            wallet, tx_hash, tx_mined_status = args
+            if wallet == self.wallet:
+                self.history_list.update_item(tx_hash, tx_mined_status)
         elif event == 'fee':
             if self.config.is_dynfee():
                 self.fee_slider.update()