ls-files tests: filter `.gitconfig` from `--others` output

The global `safe.bareRepository=all` setting in test-lib.sh is
written to `$HOME/.gitconfig`, which unfortunately lives inside the
test repository's working tree. The `.git/info/exclude` entry added
alongside it handles most commands, but `git ls-files --others`
without `--exclude-standard` does not consult `info/exclude` at
all, so the file appears in the output.

Ideally, each test that accesses a bare repository would simply
specify `--git-dir` or `GIT_DIR` explicitly, which would require no
global config and produce no side effects in the working tree. As
that approach was not taken, filter `.gitconfig` from the output
before comparing against expected results. In t7104, the test
already uses `--exclude-standard`, so it suffices to switch from
the bare `git ls-files -o` to `git ls-files -o --exclude-standard`
which respects the `info/exclude` entry; the other tests
deliberately omit `--exclude-standard` because their purpose is to
verify unfiltered `--others` output.

Assisted-by: Claude Opus 4.6
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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