Remove unused imports

src/main.rs

@@ -1,5 +1,4 @@
 use anyhow::{anyhow, bail, Result};
-use gio::prelude::{ApplicationExt, ApplicationExtManual};
 use gtk::{
     BoxExt, ButtonExt, ContainerExt, EditableSignals, EntryExt, GtkWindowExt, LabelExt, WidgetExt,
 };