AVFoundation: fix setting up the video capture session.

Because of an incorrect 'if' condition, the video capture session was
set up twice when starting the camera.

Change-Id: I4211a8c77ab9b8086628fb0f12fb28842de830cf
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@theqtcompany.com>
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/plugins/avfoundation/camera/avfmediarecordercontrol.mm

@@ -359,7 +359,7 @@ void AVFMediaRecorderControl::setupSessionForCapture()
         }
     } else if (m_connected
                && (!m_cameraControl->captureMode().testFlag(QCamera::CaptureVideo)
-                   || m_session->state() != QCamera::ActiveState)) {
+                   || m_session->state() == QCamera::UnloadedState)) {
 
         [captureSession removeOutput:m_movieOutput];