nir/lower_dynamic_bo_access: Use copy_inst_indices for our cloned instrs.

The ad-hoc index duplication was missing setup of things like the ACCESS
or RANGE_BASE fields.

Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14309>