[FixupM3u8] Obey `--hls-prefer-mpegts`

Closes #3697

yt_dlp/YoutubeDL.py

@@ -3194,8 +3194,8 @@ class YoutubeDL:
                     downloader = downloader.__name__ if downloader else None
 
                     if info_dict.get('requested_formats') is None:  # Not necessary if doing merger
-                        fixup_live = info_dict.get('is_live') and self.params.get('hls_use_mpegts') is None
-                        ffmpeg_fixup(downloader == 'HlsFD' or fixup_live,
+                        ffmpeg_fixup(downloader == 'HlsFD' and not self.params.get('hls_use_mpegts')
+                                     or info_dict.get('is_live') and self.params.get('hls_use_mpegts') is None,
                                      'Possible MPEG-TS in MP4 container or malformed AAC timestamps',
                                      FFmpegFixupM3u8PP)
                         ffmpeg_fixup(info_dict.get('is_live') and downloader == 'DashSegmentsFD',