src.ctf.lttng-live: add live_viewer_connection destructor

src.ctf.lttng-live: add live_viewer_connection destructor

Convert live_viewer_connection_destroy into a destructor.

Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Change-Id: I84651d6a2184c75b61667ebf23c28737e5a227c5
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/8471
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12386
Tested-by: jenkins <jenkins@lttng.org>