Revert "Propagate error from EventLoop creation" (#3010)

This reverts commit ed26dd58fd.
The patched was merged with a review by accident.

examples/cursor.rs

@@ -12,7 +12,7 @@ mod fill;
 
 fn main() -> Result<(), impl std::error::Error> {
     SimpleLogger::new().init().unwrap();
-    let event_loop = EventLoop::new().unwrap();
+    let event_loop = EventLoop::new();
 
     let window = WindowBuilder::new().build(&event_loop).unwrap();
     window.set_title("A fantastic window!");