[git] Remove `[color] ui = true` from `gitconfig`
[git] Remove `[color] ui = true` from `gitconfig`

In order for Git to use color for all output written to the terminal,
the configuration variable `color.ui` needs to be set to `true` or
`auto`.

Starting with Git v1.8.4, `color.ui` defaults to `auto`, so setting
this value is no longer necessary.

References:

 * http://git-blame.blogspot.no/2013/08/git-184.html
 * https://www.kernel.org/pub/software/scm/git/docs/git-config.html

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