Qnx: polishing bar-descriptor.xml files in Qt5 wizard templates

Change-Id: Ib943bdbfd6ebc7c9dfcbe5fd4995df86a3b73ff7
Reviewed-by: Mehdi Fekari <mfekari@blackberry.com>
Reviewed-by: Nicolas Arnaud-Cormos <nicolas@kdab.com>
Reviewed-by: David Kaspar <dkaspar@blackberry.com>