libvlc: libvlc_video_set_teletext(0) to disable teletext
Since 0 is an invalid page for the zvbi plugin. libvlc_video_get_teletext() will now return 0 if teletext is disabled. The teletext was already disabled by default, and libvlc_video_get_teletext() could be misleading since it returned 100 by default.
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