Revert to normal, always-active main loop mode

It doesn't actually make any sense to not use the default main loop for
this program. If I knew the updates would frequently go long spans
without changing anything, I'd do some kind of needs-refresh notice.

src/main.rs

@@ -1,10 +1,9 @@
-use bevy::{prelude::*, winit::WinitSettings};
+use bevy::prelude::*;
 
 use chaos_game_rs::ChaosGamePlugin;
 
 fn main() {
     App::new()
-        .insert_resource(WinitSettings::desktop_app())
         .add_plugins(DefaultPlugins.set(WindowPlugin {
             primary_window: Some(Window {
                 present_mode: bevy::window::PresentMode::AutoNoVsync,