style(lists): apply rustfmt to checkbox propagation

CI's cargo fmt --check flagged a few lines from the propagation patch
that exceeded the wrapping threshold. No behavioural change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/nuwiki-lsp/tests/commands_checkboxes.rs

@@ -123,7 +123,8 @@ fn checkbox_edit_finds_item_in_sublist() {
 fn checkbox_edit_uses_changes_map_not_document_changes() {
     let src = "- [ ] task\n";
     let doc = parse(src);
-    let edit = ops::checkbox_edit(src, &doc, &dummy_uri(), 0, 4, true, ops::toggle_state, true).unwrap();
+    let edit =
+        ops::checkbox_edit(src, &doc, &dummy_uri(), 0, 4, true, ops::toggle_state, true).unwrap();
     assert!(doc_changes_for(edit.clone()).is_none());
     assert!(edit.changes.is_some());
 }
@@ -238,8 +239,17 @@ fn propagate_disabled_only_emits_leaf_edit() {
   - [ ] sub4
 ";
     let doc = parse(src);
-    let edit = ops::checkbox_edit(src, &doc, &dummy_uri(), 1, 6, true, ops::toggle_state, false)
-        .expect("toggle edit");
+    let edit = ops::checkbox_edit(
+        src,
+        &doc,
+        &dummy_uri(),
+        1,
+        6,
+        true,
+        ops::toggle_state,
+        false,
+    )
+    .expect("toggle edit");
     let pairs = edits_by_line(edit);
     assert_eq!(pairs, vec![(1, "[X]".into())]);
 }