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

Prior to 05e9cd6 (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 <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: chenjianhu

t/t7450-bad-git-dotfiles.sh

@@ -402,7 +402,7 @@ test_expect_success SYMLINKS,!WINDOWS,!MINGW 'submodule must not checkout into d
 	git -C repo commit -m submodule &&
 
 	git -c protocol.file.allow=always clone --recurse-submodules repo bad-clone &&
-	! test -f "$PWD/foo" &&
+	! test -f "$PWD/bad-clone/sub/foo" &&
 	test -f $(printf "bad-clone/sub\r/post-checkout")
 '