Fix clippy warnings

src/application.rs

@@ -91,7 +91,7 @@ mod imp {
             let preferences_action = gio::ActionEntry::builder("preferences")
                 .activate(|app: &Self::Type, _, _| {
                     let window = app.active_window();
-                    let preferences = PreferencesWindow::new();
+                    let preferences = PreferencesWindow::default();
                     preferences.set_has_set_password(app.can_be_locked());
                     preferences.connect_has_set_password_notify(clone!(
                         #[weak]

src/models/keyring.rs

@@ -83,7 +83,7 @@ pub async fn has_set_password() -> anyhow::Result<bool> {
         .search_items(&attributes)
         .await
     {
-        Ok(items) => Ok(items.first().is_some()),
+        Ok(items) => Ok(!items.is_empty()),
         _ => Ok(false),
     }
 }

src/models/otp.rs

@@ -118,7 +118,6 @@ impl OTP {
 
 /// Code graciously taken from the rust-otp crate.
 /// <https://github.com/TimDumol/rust-otp/blob/master/src/lib.rs>
-
 /// Decodes a secret (given as an RFC4648 base32-encoded ASCII string)
 /// into a byte string. It fails if secret is not a valid Base32 string.
 fn decode_secret(secret: &str) -> Result<Vec<u8>> {

src/widgets/preferences/window.rs

@@ -83,10 +83,6 @@ glib::wrapper! {
 }
 
 impl PreferencesWindow {
-    pub fn new() -> Self {
-        glib::Object::new()
-    }
-
     fn setup_widget(&self) {
         let imp = self.imp();
 
@@ -137,3 +133,9 @@ impl PreferencesWindow {
         self.insert_action_group("preferences", Some(&imp.actions));
     }
 }
+
+impl Default for PreferencesWindow {
+    fn default() -> Self {
+        glib::Object::new()
+    }
+}