Gstreamer: Negotiate default settings before encoding container profile

In case if container format, video and audio codec are not provided,
need to fetch default ones.

Change-Id: I616fabc7bf9ec7c7a08a4c5dacad87a1748209f3
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

src/plugins/gstreamer/camerabin/camerabinsession.cpp

@@ -836,6 +836,8 @@ void CameraBinSession::load()
         return;
     }
 
+    m_recorderControl->applySettings();
+
 #if QT_CONFIG(gstreamer_encodingprofiles)
     GstEncodingContainerProfile *profile = m_recorderControl->videoProfile();
     if (profile) {
@@ -880,8 +882,6 @@ void CameraBinSession::start()
 
     setStatus(QCamera::StartingStatus);
 
-    m_recorderControl->applySettings();
-
     setAudioCaptureCaps();
 
     setupCaptureResolution();