wallet: (minor) fix filtering history by year

E | gui.qt.exception_window.Exception_Hook | exception caught by crash reporter
Traceback (most recent call last):
  File "...\electrum\electrum\gui\qt\main_window.py", line 870, in timer_actions
    self.update_wallet()
  File "...\electrum\electrum\gui\qt\main_window.py", line 1003, in update_wallet
    self.update_tabs()
  File "...\electrum\electrum\gui\qt\main_window.py", line 1010, in update_tabs
    self.history_model.refresh('update_tabs')
  File "...\electrum\electrum\util.py", line 412, in <lambda>
    return lambda *args, **kw_args: do_profile(args, kw_args)
  File "...\electrum\electrum\util.py", line 408, in do_profile
    o = func(*args, **kw_args)
  File "...\electrum\electrum\gui\qt\history_list.py", line 329, in refresh
    self.view.filter()
  File "...\electrum\electrum\gui\qt\util.py", line 705, in filter
    self.hide_rows()
  File "...\electrum\electrum\gui\qt\util.py", line 709, in hide_rows
    self.hide_row(row)
  File "...\electrum\electrum\gui\qt\util.py", line 685, in hide_row
    should_hide = self.should_hide(row_num)
  File "...\electrum\electrum\gui\qt\history_list.py", line 445, in should_hide
    date = tx_item['date']
KeyError: 'date'

electrum/lnworker.py

@@ -855,6 +855,7 @@ class LNWallet(LNWorker):
                 'amount_msat': chan.balance(LOCAL, ctn=0),
                 'direction': 'received',
                 'timestamp': tx_height.timestamp,
+                'date': timestamp_to_datetime(tx_height.timestamp),
                 'fee_sat': None,
                 'fee_msat': None,
                 'height': tx_height.height,
@@ -874,6 +875,7 @@ class LNWallet(LNWorker):
                 'amount_msat': -chan.balance_minus_outgoing_htlcs(LOCAL),
                 'direction': 'sent',
                 'timestamp': tx_height.timestamp,
+                'date': timestamp_to_datetime(tx_height.timestamp),
                 'fee_sat': None,
                 'fee_msat': None,
                 'height': tx_height.height,