firstboot: reset terminal settings right before asking a question

We are about to do interactivity on the terminal, hence let's ensure we
are in the TTY mode we expect to be in.

Author: poettering

src/firstboot/firstboot.c

@@ -131,6 +131,8 @@ static void print_welcome(int rfd) {
         pn = os_release_pretty_name(pretty_name, os_name);
         ac = isempty(ansi_color) ? "0" : ansi_color;
 
+        (void) reset_terminal_fd(STDIN_FILENO, /* switch_to_text= */ false);
+
         if (colors_enabled())
                 printf("\nWelcome to your new installation of \x1B[%sm%s\x1B[0m!\n", ac, pn);
         else