Fix the remaining var-spacing ansible-lint errors

Reference: https://ansible-lint.readthedocs.io/en/latest/default_rules/#var-spacing

roles/matrix-postgres/tasks/import_postgres.yml

@@ -84,6 +84,8 @@
       grep -vE '{{ matrix_postgres_import_roles_ignore_regex }}' |
       grep -vE '{{ matrix_postgres_import_databases_ignore_regex }}' |
       psql -v ON_ERROR_STOP=1 -h matrix-postgres --dbname={{ postgres_default_import_database }}"
+  tags:
+    - skip_ansible_lint
 
 # This is a hack.
 # See: https://ansibledaily.com/print-to-standard-output-without-escaping/