Remove "org_" prefix from list_allow_alphabetical.

These settings are exclusively for parsing org-mode so the prefix is redundant.

src/parser/plain_list.rs

@@ -298,7 +298,7 @@ fn counter<'b, 'g, 'r, 's>(
     context: RefContext<'b, 'g, 'r, 's>,
     input: OrgSource<'s>,
 ) -> Res<OrgSource<'s>, OrgSource<'s>> {
-    if context.get_global_settings().org_list_allow_alphabetical {
+    if context.get_global_settings().list_allow_alphabetical {
         alt((
             recognize(one_of(
                 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",