til_str: exclude \0 from res_len for til_str_buf()/til_str_to_buf()

It's more ergonomic more often to behave consistently with
strlen() here, plus it's just the established mental model.

While here I made til_settings_path_as_buf() private as nothing
external uses it, it's essentially just a logically distinct
private helper function from the public wrappers around it.

Dragged into this changeset due to clarifying some
naming/semantics as it's one of the few til_str_to_buf() callers.
But nobody was actually passing a non-NULL res_bufsz/res_len to
it anyways, as its use is minimal.

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