[ie/youtube] Replace ios with tv_simply in default clients (#14123)

Also:
- Add `web_safari` to default logged-in clients
- Add `web_creator` to default premium clients
- Flag `ios` HLS formats as requiring PO token

Closes #13702
Authored by: bashonly, coletdjnz

Co-authored-by: coletdjnz <coletdjnz@protonmail.com>

yt_dlp/extractor/youtube/_base.py

@@ -259,9 +259,8 @@ INNERTUBE_CLIENTS = {
                 not_required_with_player_token=True,
             ),
             # HLS Livestreams require POT 30 seconds in
-            # TODO: Rolling out
             StreamingProtocol.HLS: GvsPoTokenPolicy(
-                required=False,
+                required=True,
                 recommended=True,
                 not_required_with_player_token=True,
             ),