es_out: epg: do not clear nowplaying on every merge
es_out: epg: do not clear nowplaying on every merge

Split eit table updates should not clear
previous current/nowplaying status sent
from another table update.

Fixes the missing or dissapearing nowplaying
with ts programs.

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc