A conservative media watchdog is urging the Federal Communications Commission not to renew ABC’s licenses, accusing the broadcaster of partisan bias as its lucrative TV rights are up in the air. The Media Research Center, or MRC, accused ABC of electioneering, refusing to cover critical issues, excusing political violence and spreading misinformation in a Monday filing obtained by The Post. “We finally have an FCC willing to hold Disney and ABC accountable. Broadcast licenses are a privilege,