st/nine: Fix bad tracking of vs textures for NINESBT_ALL

Stateblocks with NINESBT_ALL should track all textures.
For better performance they have a faster path which
copies all the required.

This path was only tracking ps textures.

Fixes: https://github.com/iXit/Mesa-3D/issues/303



Signed-off-by: Axel Davy <davyaxel0@gmail.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

CC: "17.3 18.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit 71eae794)