qml: remove Never as request expiry option

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

@@ -6,8 +6,6 @@ import org.electrum 1.0
 ElComboBox {
     id: expires
 
-    property bool includeNever: true
-
     textRole: 'text'
     valueRole: 'value'
 
@@ -20,8 +18,6 @@ ElComboBox {
             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('1 month'), 'value': 31*24*60*60})
-            if (includeNever)
-                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) {