The CapsLock key on Atari keyboards is not a toggle, it does send the
normal make and break scancodes.

Drop the CapsLock toggle handling code, which did cause the CapsLock
key to merely act as a Shift key.
Tested-by: NMichael Schmitz <schmitzmic@gmail.com>
Signed-off-by: NMichael Schmitz <schmitzmic@gmail.com>
Signed-off-by: NAndreas Schwab <schwab@linux-m68k.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>