hlsdemux2: Don't set a referer when updating playlists

Edward Hervey requested to merge bilboed/gstreamer:hls-referer-fail into main

In the same way we don't for regular playlists in the base class.

If there is a referer specified by the app/user, the downloadhelper will set it accordingly.

Fixes playing back https://ntv1.akamaized.net/hls/live/2014075/NASA-NTV1-HLS/master_2000.m3u8 or directly the master playlist : https://ntv1.akamaized.net/hls/live/2014075/NASA-NTV1-HLS/master.m3u8

Edited by Edward Hervey

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