Server selection always in range (#130)

* Server selection stays always in the list's range
* Removed the usage of QZxing module from PageQrDecoder page
* Fixed null spelling on qml instead of nil

client/ui/qml/Pages/Protocols/PageProtoTorWebSite.qml

@@ -27,7 +27,6 @@ PageProtocolBase {
         anchors.top: caption.bottom
         anchors.left: root.left
         anchors.right: root.right
-        anchors.bottom: pb_save.top
         anchors.margins: 20
         anchors.topMargin: 10