vbo: Declare the index range invalid for DrawTransformFeedback

vbo: Declare the index range invalid for DrawTransformFeedback

Right now, we're setting the range to [0, 0] which is obviously bogus.
Instead, we should set it to be invalid like we do for DrawIndirect.

Cc: "11.1 11.2" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>