mesa: move _DrawVAOEnabledAttribs determination into st_update_array

mesa: move _DrawVAOEnabledAttribs determination into st_update_array

This can just be computed where it's used.

Now the non-glDraw paths like glRasterPos, glBegin/End, and the slow
display list path have to save and restore _VPModeInputFilter, which
is the only field that's different from the glDraw* path.

_VPModeInputFilter is a bitmask of VP inputs that might have to be bound.
The only difference with glBegin/End and the slow display list path is
that they also add VERT_BIT_MAT_ALL to the bitmask, whereas the glDraw* path
doesn't have that.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19953>