git:interactive.diffFilter: Activate diff-so-fancy

This reverts commit 43bf8801f9.

diff-so-fancy was disabled as the interactive diff-filter in
43bf8801f9 ("git:interactive.diffFilter: Disable diff-so-fancy")
because of the rewrite in C of `git add -p`.

This was fixed in v2.38.0[^1].

[^1]: https://github.com/git/git/blob/v2.38.0/Documentation/RelNotes/2.38.0.txt#L353-L356

.config/git/config

@@ -61,9 +61,7 @@
 [init]
 	defaultBranch = main
 [interactive]
-	# disbaled for now, as not compatible with git v2.37. See:
-	# https://github.com/so-fancy/diff-so-fancy/issues/437
-	# diffFilter = diff-so-fancy --patch
+	diffFilter = diff-so-fancy --patch
 	# Might need a `sudo cpan Term::ReadKey`
 	singleKey = true
 [log]