[formatsort] Remove misuse of 'preference'

'preference' is to be used only when the format is better that ALL qualities of a lower preference irrespective of ANY sorting order the user requests. See deezer.py for correct use of this

In the older sorting method, `preference`, `quality` and `language_preference` were functionally almost equivalent. So these disparities doesn't really matter there

Also, despite what the documentation says, the default for `preference` was actually 0 and not -1. I have tried to correct this and also account for it when converting `preference` to `quality`

youtube_dlc/extractor/cctv.py

@@ -162,7 +162,7 @@ class CCTVIE(InfoExtractor):
                         'url': video_url,
                         'format_id': 'http',
                         'quality': quality,
-                        'preference': -1,
+                        'source_preference': -10
                     })
 
         hls_url = try_get(data, lambda x: x['hls_url'], compat_str)