[slideslive] make the check for video_service_name case-insensitive(closes #17429)

youtube_dl/extractor/slideslive.py

@@ -8,6 +8,7 @@ from ..utils import ExtractorError
 class SlidesLiveIE(InfoExtractor):
     _VALID_URL = r'https?://slideslive\.com/(?P<id>[0-9]+)'
     _TESTS = [{
+        # video_service_name = YOUTUBE
         'url': 'https://slideslive.com/38902413/gcc-ia16-backend',
         'md5': 'b29fcd6c6952d0c79c5079b0e7a07e6f',
         'info_dict': {
@@ -19,14 +20,18 @@ class SlidesLiveIE(InfoExtractor):
             'uploader_id': 'UC62SdArr41t_-_fX40QCLRw',
             'upload_date': '20170925',
         }
+    }, {
+        # video_service_name = youtube
+        'url': 'https://slideslive.com/38903721/magic-a-scientific-resurrection-of-an-esoteric-legend',
+        'only_matching': True,
     }]
 
     def _real_extract(self, url):
         video_id = self._match_id(url)
         video_data = self._download_json(
             url, video_id, headers={'Accept': 'application/json'})
-        service_name = video_data['video_service_name']
-        if service_name == 'YOUTUBE':
+        service_name = video_data['video_service_name'].lower()
+        if service_name == 'youtube':
             yt_video_id = video_data['video_service_id']
             return self.url_result(yt_video_id, 'Youtube', video_id=yt_video_id)
         else: