uc_product_get_models doesn't respect revisions

The function uc_product_get_models() queries {uc_products} directly to get the model, which fails to account for revisions to the product. The correct db query joins on {node} and matches vid.

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$models[] = db_result(db_query("SELECT model FROM {uc_products} p INNER JOIN {node} n ON n.nid = p.nid WHERE n.vid = p.vid AND p.nid = %d", $nid));