bug#60127: treesit-end-of-defun: possible bug with clojure grammar

[Yuan Fu]

> I’d rather not use treesit_search_dfs, as it does much more work than
> the current code. You know what, I can write a custom
> ts_node_first_child_for_byte and use that in Emacs, I’ve already done
> that for ts_node_parent anyway.

I did that. I tested with the Clojure example and it works fine now.

Eli, we don’t use ts_node_first_child_for_pos for now until tree-sitter
fix that function, should I removed the boilerplate for it or should I
leave it as-is? I saw you removed ts_node_parent when I did a similar
fix.

Yuan