[options] Add --yes-playlist as inverse of --no-playlist (Fixes #5051)

youtube_dl/options.py

@@ -272,6 +272,10 @@ def parseOpts(overrideArguments=None):
         '--no-playlist',
         action='store_true', dest='noplaylist', default=False,
         help='If the URL refers to a video and a playlist, download only the video.')
+    selection.add_option(
+        '--yes-playlist',
+        action='store_false', dest='noplaylist', default=False,
+        help='If the URL refers to a video and a playlist, download the playlist.')
     selection.add_option(
         '--age-limit',
         metavar='YEARS', dest='age_limit', default=None, type=int,