[media] dib8000: Fix alignments at dib8000_tune()

There are two tabs instead of one aligning this struct.
Worse than that, on some places, the alignment is wrong.
Fix it.

No functional changes.
Acked-By: Patrick Boettcher <pboettcher@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>