dtoc: Correct the intarray-widening test case

This case was intended to check that widening an int array with an int
does nothing. Fix it.

Reported-by: Walter Lozano <walter.lozano@collabora.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Walter Lozano <walter.lozano@collabora.com>