OpenType panel: drop the first-run features binding the note no longer reads

After the merge of main, the tracked-ligatures note is the only reader of
the first run's features, and the branch replaces that check with one that
reads every frame of the story, so clippy reported the binding as unused.

crates/ui-egui/src/panels/opentype.rs

@@ -203,7 +203,6 @@ pub fn show(app: &mut VectorcraftApp, ui: &mut Ui) {
         widgets::dim_label(ui, tl!("Select text to set its OpenType features."));
         return;
     };
-    let cur = OtFeatures::from_tags(st.features.iter().map(String::as_str));
     let mut change = None;
     let fig = shown_figure(app);
     ui.horizontal(|ui| {