config: store want_color() result in a separate bool

The "git config --get-colorbool foo.bar" command not only digs in the
config to find the value of foo.bar, it evaluates the result using
want_color() to check the tty-ness of stdout.

But it stores the bool result of want_color() in the same git_colorbool
that we found in the config. This works in practice because the
git_colorbool enum is a superset of the bool values. But it is an oddity
from a type system perspective.

Let's instead store the result in a separate bool and use that.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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