tty: Port to LibMain

Author: https://github.com/kennethmyhra
Commit: 1ee93e0fe7
Pull-request: https://github.com/SerenityOS/serenity/pull/13341
Issue: https://github.com/SerenityOS/serenity/issues/11609
Reviewed-by: https://github.com/kleinesfilmroellchen ✅

Userland/Utilities/tty.cpp

@@ -5,10 +5,11 @@
  */
 
 #include <AK/Format.h>
+#include <LibMain/Main.h>
 #include <stdio.h>
 #include <unistd.h>
 
-int main(int, char**)
+ErrorOr<int> serenity_main(Main::Arguments)
 {
     char* tty = ttyname(0);
     if (!tty) {