The Devil is in the details — of his paycheck. An extra in “The Devil Wears Prada 2” went viral for revealing his salary for starring in three seconds of the movie, which he filmed for 15 hours last summer. However, first-time actor Matthew Ables revealed to The Post what he really made after subtracting the cost of the suit he was required to purchase for the gig. The content creator was issued a check for $238.50 for his work in two scenes, however, he actually took home a measly $28.50. “The suit came out to about $210, so I didn’t lose money in the end,” Ables, whose video about his experience racked up 18 million combined views, said after the film’s May 1 premiere. The Los Angeles native was walking through Midtown in July when he spotted Meryl Streep in character as Runway editor-in-chief Miranda Priestly, filming at 1221 Sixth Ave. — where the offices for the fictional magazine were located.…