Remove context from detect plain list.

src/parser/element_parser.rs

@@ -128,7 +128,7 @@ fn _detect_element<'r, 's>(
     input: OrgSource<'s>,
     can_be_paragraph: bool,
 ) -> Res<OrgSource<'s>, ()> {
-    if detect_plain_list(context, input).is_ok() {
+    if detect_plain_list(input).is_ok() {
         return Ok((input, ()));
     }
     if _element(context, input, can_be_paragraph).is_ok() {