fix(a11y): listen to screen reader changes from org.a11y.Bus

Enables the screen reader toggle to toggle when using the shortcut.

subscriptions/network-manager/src/nm_secret_agent.rs

@@ -496,7 +496,7 @@ impl SettingsSecretAgent {
         setting_attributes.insert("uuid", &conn_uuid);
         setting_attributes.insert("setting_name", &setting_name);
 
-        let mut search_items = collection
+        let search_items = collection
             .search_items(setting_attributes.clone())
             .await
             .map_err(|e| Arc::new(e))?;