remove surface maintenance requirement

src/main.rs

@@ -268,7 +268,6 @@ impl App {
             library,
             InstanceCreateInfo {
                 enabled_extensions: InstanceExtensions {
-                    ext_surface_maintenance1: true,
                     ..required_extensions
                 },
                 engine_name: Some("ImplEng".to_owned()),
@@ -612,7 +611,7 @@ impl ApplicationHandler for App {
                 .surface_capabilities(
                     &surface,
                     SurfaceInfo {
-                        present_mode: Some(present_mode),
+                        present_mode: None, // Some(present_mode),
                         ..Default::default()
                     },
                 )