bidderconfig device data not forwarded to bidders

[paulborile]

We observed that when Prebid.js calls a Prebid Server (PBS), some bidder-specific global data (which appears in .ext.prebid.bidderconfig[<bidder>].config.ortb2.device when passed to PBS) is not forwarded to the bidders (it does not appear in the Bidder Request hook). Specifically, the device data added by, for example, the Prebid.js WURFL RTD module in ortb2.device is lost during transit in PBS.