Fix line termination for response wait feature

The response wait feature waited for a line response, a string
terminated with either CR or NL. However, some devices may send a CR and
then their line content and then NL. This means tio will quit before
receiving and printing the line response. To solve this we simply ignore
the CR character and only consider lines terminated with a NL character.

This should work for all devices as lines are AFAIK always terminated
with either CRNL or a NL.

src/tty.c

@@ -1426,7 +1426,7 @@ int tty_connect(void)
 
                     if (option.response_wait)
                     {
-                        if ((input_char == '\r') || (input_char == '\n'))
+                        if (input_char == '\n')
                         {
                              tty_sync(fd);
                              exit(EXIT_SUCCESS);