iio:accel:dmard09: Tidy up white space around {} in id table

Previously inconsistent with a space after { but not before }.
Tidy that up to avoid providing a bad example that might get
copied into other drivers.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Link: https://lore.kernel.org/r/20211230174911.78291-17-jic23@kernel.org