Fix warnings

src/main.rs

@@ -27,7 +27,7 @@ use crate::quiz::*;
 use crate::repetitions::CardSetSettings;
 use crate::RootMessage::Keyboard;
 use chrono::NaiveDate;
-use iced::{keyboard, Program, Subscription, Theme};
+use iced::{keyboard, Subscription, Theme};
 use iced::{window, Font};
 use iced_core::window::Position;
 use iced_core::Size;