Qnx: Fixing insufficient update of "API Level and Runtime" options page

Task-number: QTCREATORBUG-11793
Change-Id: I882c43580ced2601bcc2176b27adc32de88df1b2
Reviewed-by: Mehdi Fekari <mfekari@blackberry.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: David Kaspar <dkaspar@blackberry.com>