Remove extra TIOCSWINSZ ioctl on startup

The openpty call already performs it, thus no need to call it one more
with the exact same size since it confuses some applications.

alacritty_terminal/src/tty/unix.rs

@@ -280,9 +280,7 @@ pub fn new(config: &Options, window_size: WindowSize, window_id: u64) -> Result<
                 set_nonblocking(master_fd);
             }
 
-            let mut pty = Pty { child, file: File::from(master), signals };
-            pty.on_resize(window_size);
-            Ok(pty)
+            Ok(Pty { child, file: File::from(master), signals })
         },
         Err(err) => Err(Error::new(
             err.kind(),