search: expose info() with --format-stdin
search: expose info() with --format-stdin

`aur query ... | aur format ...` pipelines can be trivially reconstructed, but info()
cannot be recovered trivially from an `aur format ... | info` pipeline.

Change `--format-stdin` so that it only runs `info()` with arguments from standard input.

AladW/aurutils,AladW/aurutils