Fix icons not showing when using flake

src/ui/app.rs

@@ -4,7 +4,7 @@ use chrono::Utc;
 use gtk::prelude::*;
 use relm4::{
     component::{AsyncComponent, AsyncComponentParts, AsyncController},
-    gtk::Adjustment,
+    gtk::{gdk, Adjustment},
     prelude::*,
     AsyncComponentSender,
 };
@@ -115,6 +115,10 @@ impl AsyncComponent for AppModel {
         sender: AsyncComponentSender<Self>,
     ) -> AsyncComponentParts<Self> {
         relm4_icons::initialize_icons();
+        let display = gdk::Display::default().unwrap();
+        let theme = gtk::IconTheme::for_display(&display);
+        theme.add_resource_path("/org/gtkrs/icons/");
+        theme.add_resource_path("/org/gtkrs/icons/scalable/actions/");
 
         let mcdu = McduModel::builder()
             .launch(())