qml: add never-expiring requests. fixes #8631

electrum/gui/qml/components/controls/RequestExpiryComboBox.qml

@@ -17,6 +17,7 @@ ElComboBox {
             expiresmodel.append({'text': qsTr('1 hour'), 'value': 60*60})
             expiresmodel.append({'text': qsTr('1 day'), 'value': 24*60*60})
             expiresmodel.append({'text': qsTr('1 week'), 'value': 7*24*60*60})
+            expiresmodel.append({'text': qsTr('Never'), 'value': 0})
             expires.currentIndex = 0
             for (let i=0; i < expiresmodel.count; i++) {
                 if (expiresmodel.get(i).value == Config.requestExpiry) {