USB: serial: kobil_sct: restore initial terminal settings

Commit 6a6c8b362be3 ("usb, kobil: Sort out some bogus tty handling")
intended to fix and clean up the device-specific initial terminal
settings but instead confused the termios input and local control flags
and re-enabled ICRNL and IXON.

Drop the bogus masking of l-flags from the default i-flags (which has no
effect) and restore the original device-specific i-flags.

Fixes: 6a6c8b362be3 ("usb, kobil: Sort out some bogus tty handling")
Signed-off-by: Johan Hovold <[e-mail]>

drivers/usb/serial/kobil_sct.c

···
 {
 	/* Default to echo off and other sane device settings */
 	tty->termios.c_lflag = 0;
-	tty->termios.c_iflag &= ~(ISIG | ICANON | ECHO | IEXTEN | XCASE);
-	tty->termios.c_iflag |= IGNBRK | IGNPAR | IXOFF;
+	tty->termios.c_iflag = IGNBRK | IGNPAR | IXOFF;
 	/* do NOT translate CR to CR-NL (0x0A -> 0x0A 0x0D) */
 	tty->termios.c_oflag &= ~ONLCR;
 }