Revert "core: Do not treat 'npt=0-' as seek request"
Revert "core: Do not treat 'npt=0-' as seek request"

This reverts commit 15d7783f850a28a221bca49eac118d6744c8d9b6.

jku/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,GNOME/rygel,GNOME/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel