t7450: inspect the correct path a broken code would write to

Prior to 05e9cd64 (config: quote values containing CR character, 2025-05-19), a repository can trick "clone --recurse-submodules" into running a post-checkout hook shipped with the project. The test was written to make sure the trick would no longer run the hook with the fix in the commit. However, the test did not check for the path the hook would create; correct the path to the expected one if the bug were still with us. Signed-off-by: chenjianhu <chenjianhu@kylinos.cn> Signed-off-by: Junio C Hamano <gitster@pobox.com>