NBC won Monday in the demo and total viewers with The Voice again winning the singing competition derby to finish as the night’s No.1 show in both metrics. But 8-10 PM Voice (1.5, 8.28M) dropped a tick while ABC’s two-hour American Idol (1.4, 7.59M) inched up, producing the season’s closest head-to-head finish for the wo singing competitions. At 10 PM, NBC's Good Girls (0.9, 4.14M) took the 10 PM hour in the demo while ABC's Crossing (0.7, 4.24M) snagged top spot in total…