Revert "qml: don't update (and by extension initialize) requestModel, as it isn't used"

This reverts commit 27711093d2.

electrum/gui/qml/qewallet.py

@@ -651,8 +651,7 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
             return
 
         assert key is not None
-        # requestModel not used, so don't update
+        self.requestModel.add_invoice(self.wallet.get_request(key))
-        # self.requestModel.add_invoice(self.wallet.get_request(key))
         self.requestCreateSuccess.emit(key)
 
     @pyqtSlot()
@@ -678,8 +677,7 @@ class QEWallet(AuthMixin, QObject, QtEventListener):
             return
 
         assert key is not None
-        # requestModel not used, so don't update
+        self.requestModel.add_invoice(self.wallet.get_request(key))
-        # self.requestModel.add_invoice(self.wallet.get_request(key))
         self.requestCreateSuccess.emit(key)
 
     @pyqtSlot(str)