Add an fd argument to sudo_get_ttysize() instead of always using stderr.

For sudoreplay we open /dev/tty, so use that instead of stderr when
determining the terminal size.

src/parse_args.c

@@ -755,7 +755,7 @@ usage(void)
 {
     int rows, cols;
 
-    sudo_get_ttysize(&rows, &cols);
+    sudo_get_ttysize(STDERR_FILENO, &rows, &cols);
     display_usage(usage_err, cols);
     exit(EXIT_FAILURE);
 }
@@ -796,7 +796,7 @@ help(void)
     int rows, cols;
     debug_decl(help, SUDO_DEBUG_ARGS);
 
-    sudo_get_ttysize(&rows, &cols);
+    sudo_get_ttysize(STDERR_FILENO, &rows, &cols);
     sudo_lbuf_init(&lbuf, usage_out, indent, NULL, cols);
     if (strcmp(pname, "sudoedit") == 0) {
 	sudoedit = true;