Update endpoint for Bing Search

[MaxiPigna]

Update the following endpoint

cognitive-services-REST-api-samples/Tutorials/Bing-Web-Search/public/js/script.js

Line 281 in 945e761

var endpoint = "https://api.cognitive.microsoft.com/bing/v7.0/search";

with the new one https://api.bing.microsoft.com/v7.0/search

[MaxiPigna]

Duplicated #172