curses: Fix control-{@[\]^_} and ESC
control-{@[\]^_} shouldn't get the 'a' - 'A' offset for correct
translation. ESC is better simulated as escape key.
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Signed-off-by: Andrew Zaborowski <balrogg@gmail.com>