fix: Remove EXT-X-ENDLIST from master playlist file

[dave-nicholas]

I am a contributor on the shaka project and noticed that playback was broken with this library.
This PR fixes a bug in the master playlist and allows playback with shaka (and probably other players where playback previously failed).

Unlike the EXTM3U element which is required at the start every Media Playlist and every Master Playlist. The EXT-X-ENDLIST should only appear in a Media Playlist file.

[exxsy]

Yeah EXT-X-ENDLIST line causes shaka player to throw error

[exxsy]

If you just dont want to wait PR,

Create a PlaylistGenerator for this case, like this one.

namespace App\PlaylistGenerators;

class HLSExtendedGenerator implements PlaylistGenerator
{
    public const PLAYLIST_START = '#EXTM3U';

    private function getStreamInfoLine(Media $segmentPlaylistMedia, string $key): string
    {
        $segmentPlaylist = $segmentPlaylistMedia->getDisk()->get(
            $segmentPlaylistMedia->getDirectory() . HLSExporter::generateTemporarySegmentPlaylistFilename($key)
        );

        $lines = DynamicHLSPlaylist::parseLines($segmentPlaylist)->filter();

        return $lines->get($lines->search($segmentPlaylistMedia->getFilename()) - 1);
    }

    public function get(array $segmentPlaylists, PHPFFMpeg $driver): string
    {
        return Collection::make($segmentPlaylists)->map(function (Media $segmentPlaylist, $key) use ($driver) {
            $streamInfoLine = $this->getStreamInfoLine($segmentPlaylist, $key);

            $media = (new MediaOpener($segmentPlaylist->getDisk(), $driver))
                ->openWithInputOptions($segmentPlaylist->getPath(), ['-allowed_extensions', 'ALL']);

            if ($media->getVideoStream()) {
                if ($frameRate = StreamParser::new($media->getVideoStream())->getFrameRate()) {
                    $streamInfoLine .= ",FRAME-RATE={$frameRate}";
                }
            }

            return [$streamInfoLine, $segmentPlaylist->getFilename()];
        })->collapse()->prepend(self::PLAYLIST_START)->implode(PHP_EOL);
    }
}

Then use it like this,

        FFMpeg::fromDisk("videos")
            ->open("/$this->name.$this->extension")
            ->exportForHLS()
            ->withPlaylistGenerator(new HLSExtendedGenerator)
            ->setSegmentLength(10)->...