[m-dev.] indent 0 in hlds dumps

[Julien Fischer]

On Sat, 7 Aug 2021, Zoltan Somogyi wrote:

> Would anyone object if I removed the Indent arguments
> from predicates in hlds_out_*.m where those arguments
> only ever contain zero? At the moment, write_hlds itself
> is called with an indent of zero from passes_aux.m, and
> in a quarter of a century, to the best of my knowledge,
> never used any other indent level. Removing all the
> do-nothing calls to write_indent would remove some
> clutter from the code.
>
> Goals and other structured entities that don't fit on one line
> would still be indented, of course.

No objection from me.

Julien.