test: gstreamer: Use env instead of registry edit

Instead of editing the registry, use gst_env variable provided by the plugin and
already used as part of the devenv shell. This reduces the complexity of the
C++ test code.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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