fix #2114: update utxo_list when freezing address

gui/qt/main_window.py

@@ -1478,6 +1478,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
     def set_frozen_state(self, addrs, freeze):
         self.wallet.set_frozen_state(addrs, freeze)
         self.address_list.update()
+        self.utxo_list.update()
         self.update_fee()
 
     def create_list_tab(self, l):

gui/qt/utxo_list.py

@@ -51,7 +51,7 @@ class UTXOList(MyTreeWidget):
             utxo_item.setFont(1, QFont(MONOSPACE_FONT))
             utxo_item.setData(0, Qt.UserRole, name)
             if self.wallet.is_frozen(address):
-                utxo_item.setBackgroundColor(0, QColor('lightblue'))
+                utxo_item.setBackgroundColor(1, QColor('lightblue'))
             self.addChild(utxo_item)
 
     def create_menu(self, position):