[settings] Match terminology used elsewhere

iPXE documentation tends to refer to "settings" rather than "options",
since settings can be more general than DHCP options.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/tui/settings_ui.c

 	clearmsg ( TITLE_ROW );
 	name = settings_name ( widget->settings );
 	attron ( A_BOLD );
-	msg ( TITLE_ROW, "iPXE option configuration%s%s",
+	msg ( TITLE_ROW, "iPXE configuration settings%s%s",
 	      ( name[0] ? " - " : "" ), name );
 	attroff ( A_BOLD );
 }