Fix some Postgres CLI scripts to target the correct database

Fixes a regression introduced in 95346f3117.

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/814

Using `matrix_synapse_` variables in the `matrix-postgres` role is not
ideal, but.. this script belongs neither here, nor there.
We'll have it be like that for now.

roles/matrix-postgres/templates/usr-local-bin/matrix-change-user-admin-status.j2

@@ -16,4 +16,4 @@ docker run \
 	--env-file={{ matrix_postgres_base_path }}/env-postgres-psql \
 	--network {{ matrix_docker_network }} \
 	{{ matrix_postgres_docker_image_to_use }} \
-	psql -h {{ matrix_postgres_connection_hostname }} -c "UPDATE users set admin=$2 WHERE name like '@$1:{{ matrix_domain }}'"
+	psql -h {{ matrix_postgres_connection_hostname }} --dbname={{ matrix_synapse_database_database }} -c "UPDATE users set admin=$2 WHERE name like '@$1:{{ matrix_domain }}'"

roles/matrix-postgres/templates/usr-local-bin/matrix-postgres-update-user-password-hash.j2

@@ -13,4 +13,4 @@ docker run \
 	--env-file={{ matrix_postgres_base_path }}/env-postgres-psql \
 	--network {{ matrix_docker_network }} \
 	{{ matrix_postgres_docker_image_to_use }} \
-	psql -h {{ matrix_postgres_connection_hostname }} -c "UPDATE users set password_hash='$2' WHERE name = '@$1:{{ matrix_domain }}'"
+	psql -h {{ matrix_postgres_connection_hostname }} --dbname={{ matrix_synapse_database_database }} -c "UPDATE users set password_hash='$2' WHERE name = '@$1:{{ matrix_domain }}'"