Allow setting diff.worddiff=color via gitconfig

From: Olliver Schinagl <oliver@schinagl.nl>
Date: Feb 28, 2024, 08:54 UTC
Message-ID: <a7be415d-5005-4fa7-9b2e-1974b7439a81@schinagl.nl>

Currently, the only way to set `word-diff=color` is through alias. It would be much nicer of course if we could do

[diff]
     worddiff=color

in git-config of course.

Thank you,

Olliver

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