package/gettext-tiny: fix gettext wrapper

When a textdomain is specified, we ignore it twice: we shift args, and
we printf ${2}, which would yield an empty printf.

Fix that by not shifting, and just printf ${2}; this is nicer.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Vadim Kochan <vadim4j@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>