Make ControlFlow::Wait the default (#3106)

examples/key_binding.rs

@@ -4,7 +4,7 @@
 use winit::{
     dpi::LogicalSize,
     event::{ElementState, Event, WindowEvent},
-    event_loop::{ControlFlow, EventLoop},
+    event_loop::EventLoop,
     keyboard::{Key, ModifiersState},
     // WARNING: This is not available on all platforms (for example on the web).
     platform::modifier_supplement::KeyEventExtModifierSupplement,
@@ -32,8 +32,6 @@ fn main() -> Result<(), impl std::error::Error> {
     let mut modifiers = ModifiersState::default();
 
     event_loop.run(move |event, elwt| {
-        elwt.set_control_flow(ControlFlow::Wait);
-
         if let Event::WindowEvent { event, .. } = event {
             match event {
                 WindowEvent::CloseRequested => elwt.exit(),