Tweak the default behavior of psql's \dconfig.

\dconfig without an argument originally printed all parameters,
but it seems more useful to print only those parameters with
non-default settings.  You can easily get the show-everything
behavior with "\dconfig *", but that output is unwieldy and
seems unlikely to be wanted very often.

Per suggestion from Christoph Berg.

Discussion: https://postgr.es/m/YlFQLzlPi4QD0wSi@msg.df7cb.de

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