added missing z flag

roles/matrix-sms-bridge/templates/systemd/matrix-sms-bridge.service.j2

@@ -30,7 +30,7 @@ ExecStart=/usr/bin/docker run --rm --name matrix-sms-bridge \
 			-v {{ matrix_sms_bridge_data_path }}:/data:z \
 			-v {{ matrix_sms_bridge_config_path }}/gammu-smsdrc:/etc/gammu-smsdrc:z \
 			--privileged \
-			-v /dev:/dev \
+			-v /dev:/dev:z \
 			{% for arg in matrix_sms_bridge_container_extra_arguments %}
 			{{ arg }} \
 			{% endfor %}