Make ControlFlow::Wait the default (#3106)

examples/multiwindow.rs

@@ -5,7 +5,7 @@ use std::collections::HashMap;
 use simple_logger::SimpleLogger;
 use winit::{
     event::{ElementState, Event, KeyEvent, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
+    event_loop::EventLoop,
     keyboard::Key,
     window::Window,
 };
@@ -27,8 +27,6 @@ fn main() -> Result<(), impl std::error::Error> {
     println!("Press N to open a new window.");
 
     event_loop.run(move |event, elwt| {
-        elwt.set_control_flow(ControlFlow::Wait);
-
         if let Event::WindowEvent { event, window_id } = event {
             match event {
                 WindowEvent::CloseRequested => {