Issue with latest Bing changes

[ebalassanian]

I'm seeing an issue with the latest changes to fix Bing. Specifically, Bing is returning search results from the first search used. To repro: search with bing using a search term like "microsoft", then search again with a new term like "google". You'll see the results returned in the second set matching the search term "microsoft" instead of google. This happens even when a new DZNPhotoPickerController is instantiated between searches so the culprit is likely the Bing search query not being reset.