Use 0.16.1 for riot-web, as the image for 0.16.2 is still unavailable

roles/matrix-server/defaults/main.yml

@@ -108,7 +108,7 @@ matrix_docker_image_postgres_latest: "{{ matrix_docker_image_postgres_v10 }}"
 
 matrix_docker_image_synapse: "matrixdotorg/synapse:v0.33.3"
 matrix_docker_image_nginx: "nginx:1.15.2-alpine"
-matrix_docker_image_riot: "avhost/docker-matrix-riot:v0.16.2"
+matrix_docker_image_riot: "avhost/docker-matrix-riot:v0.16.1"
 matrix_docker_image_s3fs: "xueshanf/s3fs:latest"
 matrix_docker_image_goofys: "cloudproto/goofys:latest"
 matrix_docker_image_coturn: "instrumentisto/coturn:4.5.0.7"