qtmod_test: Fix the usage of `--module-subset' command
qtmod_test: Fix the usage of `--module-subset' command

This enable us to use just the modules that are required.

Change-Id: Icc82b2290227ab96c5187ebb95709dc087e1d8fc
Reviewed-on: http://codereview.qt.nokia.com/3680
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Rohan McGovern <d75463945f40a9669160a73cef2843e56b22c602@nokia.com>

tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa,tsarajar/qtqa