IT WAS a sweet off-season for NBC's much-praised Friday Night Lights. The football drama that never cracked Nielsen's Top 50 won an Emmy (Outstanding Casting) and was renewed and given a 9 p.m. Friday slot. So, Lights is back (it premieres this week), but will fans recognize it? To boost ratings, it appears that teen drama will be played up this season, with football action cut back—turning FNL into The O.C. in shoulder pads. The first episode introduces a cute Swedish student and hints at promiscuity. Pigskin lovers must make do with a few scenes of practice and a ring ceremony.