[Bug] `transform_list_item` generate extra paragraph tag

[Timeless0911]

If we have extra empty line in listitem, we will get hast

which caused spacing between list items increased

If we remove the extra empty line, we will get hast below which do not have paragraph tag

The spacing between list items behave well.

related code:

mdx-rs/crates/mdx_rs/src/mdast_util_to_hast.rs

Lines 711 to 716 in 18ad02b

	fn transform_list_item(
	state: &mut State,
	node: &mdast::Node,
	parent: Option<&mdast::Node>,
	list_item: &mdast::ListItem,
	) -> Result {

This is forked from https://github.com/wooorm/mdxjs-rs