at_wini: removed RO_BIT misfeature, not used any more

pm: fixed rebooting by making a copy of the monitor code from the user
    process. this is necessary because that process is dead by the time
    sys_abort() is called.

    also added more info to the "can't reply" panic.

drivers/at_wini/at_wini.c

@@ -681,9 +681,6 @@ message *m_ptr;
 	return(EACCES);
 #endif
 
-   /* If it's not an ATAPI device, then don't open with RO_BIT. */
-   if (!(wn->state & ATAPI) && (m_ptr->COUNT & RO_BIT)) return EACCES;
-
   /* Partition the drive if it's being opened for the first time,
    * or being opened after being closed.
    */