qml: don't init QERequestListModel/requestModel

electrum/gui/qml/qeinvoicelistmodel.py

@@ -223,7 +223,8 @@ class QERequestListModel(QEAbstractInvoiceListModel, QtEventListener):
         return item
 
     def get_invoice_list(self):
-        return self.wallet.get_unpaid_requests()
+        # disable for now, as QERequestListModel isn't used in UI
+        return [] #self.wallet.get_unpaid_requests()
 
     def get_invoice_for_key(self, key: str):
         return self.wallet.get_request(key)