The city finally cleaned up the vile Queens hovel belonging to the Big Apple’s most notorious homeless lovebirds — only after The Post reported about the shocking eyesore — but left behind a main source of the pigsty. Marabel and Michael — the booze-guzzling, sex-having, sidewalk-defecating duo who turned 30th Avenue near Steinway Street into their personal playpen– had their encampment in Mayor Mamdani’s old Astoria neighborhood cleaned out twice this week, delighting locals who had dodged the