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util/prim_restart: revert part of bad fix

Erik Faye-Lund requested to merge kusma/mesa:zink-fix-primitive-restart-regression into main

When drawing using util_translate_prim_restart_ib, zink explicitly ignores pipe_draw_start_count_bias::start, because util_translate_prim_restart_ib used to create a new index-buffer without padding at the start.

This makes a lot of sense, because creating a padded index buffer is just wasteful.

So let's walk back on the choice of starting to pad the output buffer.

Fixes: 1272c2e0 ("util/prim_restart: fix util_translate_prim_restart_ib") Closes: #4851 (closed)

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