Revert "chase: invert CHASE_NO_AUTOFS and only set it where needed"

This reverts commit 490aa05ca1.

As commented https://github.com/systemd/systemd/pull/38569#discussion_r2284978273,
the commit makes autofs check bypassed. Before the commit, when
CHASE_NO_AUTOFS is set, we did not shortcut chasing paths, and refused
any autofs mount points in the path. However, with the commit, the flag
was swapped but even when CHASE_AUTOFS is unset, the autofs check may be
skipped.

To fix the issue, rather than swapping the flag, we should introduce
another flag, say CHASE_TRIGGER_AUTOFS. This revert the commit, and in a
later commit, the new flag will be introduced.

src/libsystemd/sd-device/sd-device.c

@@ -2476,7 +2476,7 @@ int device_chase(sd_device *device, const char *path, ChaseFlags flags, char **r
 
         _cleanup_free_ char *resolved = NULL;
         _cleanup_close_ int fd = -EBADF;
-        r = chase(path, /* root = */ NULL, flags, &resolved, ret_fd ? &fd : NULL);
+        r = chase(path, /* root = */ NULL, CHASE_NO_AUTOFS | flags, &resolved, ret_fd ? &fd : NULL);
         if (r < 0)
                 return r;