gui_stdio: fix tabs->spaces

gui/gui_stdio.py

@@ -100,12 +100,12 @@ class ElectrumGui:
         messages = []
 
         for item in self.wallet.get_tx_history():
-            tx_hash, conf, is_mine, value, fee, balance, timestamp = item
+            tx_hash, confirmations, is_mine, value, fee, balance, timestamp = item
-            if conf:
+            if confirmations:
                 try:
                     time_str = datetime.datetime.fromtimestamp( timestamp).isoformat(' ')[:-3]
                 except:
-                    time_str = "------"
+                    time_str = "unknown"
             else:
                 time_str = 'pending'