cam: Store camera as shared pointer everywhere

Do not store the camera raw pointer in the capture class, this will
prevent forwarding the shared pointer in the future.

Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/cam/main.cpp

@@ -319,7 +319,7 @@ int CamApp::run()
 	}
 
 	if (options_.isSet(OptCapture)) {
-		Capture capture(camera_.get(), config_.get());
+		Capture capture(camera_, config_.get());
 		return capture.run(loop_, options_);
 	}