Reset on system change
Reset on system change

Otherwise it tried to maintain its data, which is not useful when we
should just reset anyways.

Change-Id: Id7bbabed67d8549d4842c1e5e6bf87ba93508d62
Reviewed-on: http://codereview.qt-project.org/4705
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Martin Jones <d1da02505c7f228af82a23235becb435f45569f5@nokia.com>

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