i965: re-emit index buffer state on a reset option change.

Seems like we forget to update the index buffer (ib) status and
IndexedDrawCutIndexEnable or CutIndexEnable flag is left unchanged it
leads to ignoring of glEnable/glDisable functions for GL_PRIMITIVE_RESTART
in some cases. The index buffer (ib) status should be re-emmited after the
reset option change to avoid some unexpected behavior.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109451


Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Andrii Simiklit <andrii.simiklit@globallogic.com>
Signed-off-by: Andrii Simiklit <asimiklit.work@gmail.com>
(cherry picked from commit f4f4ec94)