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qt: kind of fix bip70 notify_merchant logic by passing around PI

```
229.18 | E | gui.qt.main_window.[test_segwit_2] | on_error
Traceback (most recent call last):
  File "...\electrum\gui\qt\util.py", line 917, in run
    result = task.task()
  File "...\electrum\gui\qt\send_tab.py", line 681, in broadcast_thread
    if self.payto_e.payment_identifier.has_expired():
AttributeError: 'NoneType' object has no attribute 'has_expired'
```

In SendTab.broadcast_transaction.broadcast_thread, self.payto_e.payment_identifier was referenced -
but do_clear() has already cleared it by then.
E.g. consider SendTab.pay_onchain_dialog: it calls save_pending_invoice(), which calls do_clear(),
and later (in sign_done), it calls window.broadcast_or_show, which will call SendTab.broadcast_transaction().

As there might be multiple independent transaction dialogs open simultaneously, the single shared state
send_tab.payto_e.payment_identifier approach was problematic -- I think it is conceptually nicer to
pass around the payment_identifiers as needed, as done with this change.

However, this change is not a full proper fix, as it still somewhat relies on
send_tab.payto_e.payment_identifier (e.g. in pay_onchain_dialog). Hence, e.g. when using
the invoice_list context menu "Pay..." item, as payto_e.payment_identifier is not set,
payment_identifier will be None in broadcast_transaction.

but at least we handle PI being None gracefully -- before this change, broadcast_transaction
expected PI to be set, and it was never set to the correct thing (as do_clear() already ran by then):
depending on timing it was either None or a new empty PI. In the former case, producing the above
traceback and hard failing (not only for bip70 stuff!), and in the latter, silently ignoring the logic bug.

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Source Files on job 5332878263844864.5