[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/cammodels.py

@@ -82,7 +82,7 @@ class CamModelsIE(InfoExtractor):
                     f.update({
                         'ext': 'mp4',
                         # hls skips fragments, preferring rtmp
-                        'preference': -1,
+                        'quality': -10,
                     })
                 else:
                     continue