[yandex video][yandex efir] fixed extractor

Fixed extractor for Yandex Video and Yandex Efir(single program and program on channel).
Latest version of Yandex Video and Yandex Efir not support request for external json. Now json data with video information used as a parameter in methods of Yandex stream player at webpage.
Current extractor find call of Yandex stream player, parse parameters and find information about program.

youtube_dl/extractor/yandexvideo.py

@@ -65,7 +65,7 @@ class YandexVideoIE(InfoExtractor):
         'only_matching': True,
     }]
 
-    def split_params(self, txt: str) -> []:
+    def split_params(self, txt):
         braket = 0
         line = ''
         items = []