fix: don't check for plid length

playlist ids can be of many lengths (at least 18, 34 and 36) and there
doesn't seem to be a rule for how many characters encode a typical
(non-mix, video-related) playlist. such validation requires more
research.

ythdd_inv_tl.py

@@ -886,8 +886,10 @@ def playlists(data, req, only_json: bool = False):
 
 	plid = data[3]
 
-	if len(plid) not in (34, 36):
-		print("error(playlists): len(plid) is not 34 or 36...!")
+	# no info about what length can playlists be
+	# settle for a basic sanity check instead
+	# if len(plid) not in (18, 34, 36):
+	if not plid.startswith("PL"):
 		response = {"error": "Only standard playlists are currently supported (no mixes, video-based playlists, etc.)"}
 		if only_json:
 			return response