Use new security-opt syntax (: -> =)

Related to https://docs.docker.com/engine/deprecated/#separator--of---security-opt-flag-on-docker-run

roles/custom/matrix-synapse/templates/goofys/systemd/matrix-goofys.service.j2

@@ -17,7 +17,7 @@ ExecStart={{ devture_systemd_docker_base_host_command_docker }} run --rm --name
 			--mount type=bind,src=/etc/passwd,dst=/etc/passwd,ro \
 			--mount type=bind,src=/etc/group,dst=/etc/group,ro \
 			--mount type=bind,src={{ matrix_s3_media_store_path }},dst=/s3,bind-propagation=shared \
-			--security-opt apparmor:unconfined \
+			--security-opt apparmor=unconfined \
 			--cap-add mknod \
 			--cap-add sys_admin \
 			--device=/dev/fuse \