Level : getSeqNumFromProgramDate() optimize
Level : getSeqNumFromProgramDate() optimize

don't iterate if target program date is higher than last fragment program date
related to https://github.com/mangui/flashls/issues/405

codex-corp/flashls,tedconf/flashls,vidible/vdb-flashls,NicolasSiver/flashls,neilrackett/flashls,hola/flashls,fixedmachine/flashls,neilrackett/flashls,clappr/flashls,NicolasSiver/flashls,vidible/vdb-flashls,tedconf/flashls,jlacivita/flashls,codex-corp/flashls,hola/flashls,jlacivita/flashls,mangui/flashls,mangui/flashls,clappr/flashls,fixedmachine/flashls