diff: restore original color scheme for worddiff
I'm not young. "red dim" is nearly invisible, and "red" vs "red dim" is
too subtle to see difference. And, "underline" is necessary to highlight
whitespace changes.
#require clang-format test-repo
$ . "$TESTDIR/helpers-testrepo.sh"
$ cd "$TESTDIR"/..
$ for f in `testrepohg files 'set:(**.c or **.cc or **.h) and not "listfile:contrib/clang-format-ignorelist"'` ; do
> clang-format --style file $f > $f.formatted
> cmp $f $f.formatted || diff -u $f $f.formatted
> rm $f.formatted
> done