fix: explicitly declare old behavior for treesitter iter_matches

[RayGuo-ergou]

Description

There's a breaking change in neovim's treesitter iter_matches neovim/neovim#30193.

For now I think can use the backward compatibility flag all = false ( subject to remove in the future ) see:

https://github.com/neovim/neovim/blob/ae9674704ac5586438f60c883e918d448ef0e237/runtime/doc/treesitter.txt#L1243-L1247

[kevinhwang91]

Thanks, I see nvim-treesister has added this opt.

The default
    option `all=false` is only provided for backward compatibility and will be
    removed after Nvim 0.10.

we should refer to nvim-treesister in the future if this opt is removed.