bcachefs: Pass _orig_restart_count to trans_was_restarted

_orig_restart_count is unused now, according to the logic, trans_was_restarted
should be using _orig_restart_count.

Signed-off-by: Alan Huang <mmpgouride@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>