Prevent gratuitous resizing in integration example

If I didn't miss anything, that `resized` variable is never set back to `false`, meaning that swapchain recreation is retriggered every frame after the first resize.

examples/integration/src/main.rs

@@ -144,6 +144,8 @@ pub fn main() {
                             present_mode: wgpu::PresentMode::Mailbox,
                         },
                     );
+                    
+                    resized = false;
                 }
 
                 let frame = swap_chain.get_next_texture().expect("Next frame");