Use libvlc_playlist_add_extended_untrusted in mozilla plugin.

(cherry picked from commit e1d3ebea)
Signed-off-by: Rémi Denis-Courmont <rdenis@simphalempin.com>

projects/mozilla/control/npolibvlc.cpp

@@ -1481,7 +1481,7 @@ RuntimeNPObject::InvokeResult LibvlcPlaylistNPObject::invoke(int index, const NP
                     }
                 }
 
-                int item = libvlc_playlist_add_extended(p_plugin->getVLC(),
+                int item = libvlc_playlist_add_extended_untrusted(p_plugin->getVLC(),
                                                                   url,
                                                                   name,
                                                                   i_options,