[bloomberg] Fix test_Bloomberg

In this test case, sometimes HLS is the best format while sometimes HDS
is. To prevent occasional test failures, force HDS to be the best
format. In the past, testing against HDS formats causes the same error
as #9214, which is fixed as #9377 landed.

youtube_dl/extractor/bloomberg.py

@@ -17,6 +17,9 @@ class BloombergIE(InfoExtractor):
             'title': 'Shah\'s Presentation on Foreign-Exchange Strategies',
             'description': 'md5:a8ba0302912d03d246979735c17d2761',
         },
+        'params': {
+            'format': 'best[format_id^=hds]',
+        },
     }, {
         'url': 'http://www.bloomberg.com/news/articles/2015-11-12/five-strange-things-that-have-been-happening-in-financial-markets',
         'only_matching': True,