iio:proximity:ping: White space cleanup of spacing around {} in id tables

The spacing in this driver was inconsistent so make sure we have a space
after { and before } for the two id tables.
Avoid providing examples of this inconsistency that get copied into new
drivers.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Andreas Klinger <ak@it-klinger.de>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Link: https://lore.kernel.org/r/20211230174911.78291-7-jic23@kernel.org