[BUG] git init doesn't respect `--template` like configuration variable init.templateDir and $GIT_TEMPLATE_DIR

[Doron Behar]

The title says it all.

If I run `git init --template=~/path/to/my/template` I get the following
message:

        warning: templates not found ~/path/to/my/template

But, if I run:

        $ env GIT_TEMPLATE_DIR=~/path/to/my/template git init

I don't get a warning and the template is used just fine.

If I configure the configuration variable `init.templateDir` to
`~/path/to/my/template` and run `git init` I don't get a warning and the
template is used just fine.

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