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/sysupdate/sysupdate-transfer.c

@@ -1498,7 +1498,7 @@ int transfer_install_instance(
                         assert_not_reached();
 
                 if (resolve_link_path && root) {
-                        r = chase(link_path, root, CHASE_PREFIX_ROOT|CHASE_NONEXISTENT|CHASE_AUTOFS, &resolved, NULL);
+                        r = chase(link_path, root, CHASE_PREFIX_ROOT|CHASE_NONEXISTENT, &resolved, NULL);
                         if (r < 0)
                                 return log_error_errno(r, "Failed to resolve current symlink path '%s': %m", link_path);