t9300: test verification of renamed paths

t9300: test verification of renamed paths

Commit da91a90c2f (fast-import: disallow more path components,
2024-11-30) added two separate verify_path() calls (one for
added/modified files, and one for renames/copies). But our tests only
exercise the first one. Let's protect ourselves against regressions by
tweaking one of the tests to rename into the bad path. There are
adjacent tests that will stay as additions, so now both calls are
covered.

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