bug#20728: 25.0.50; grep and grep-find templates should have a place holder for the --color argument

[Eli Zaretskii]

> Cc: 20728@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Thu, 4 Jun 2015 19:55:19 +0300
> 
> On 06/04/2015 06:39 PM, Eli Zaretskii wrote:
> 
> > By plugging it directly into the command.
> 
> Without a placeholder? How?

With a placeholder that is %s, like we do with all the rest when we
format a string.