YOUR MANIC TOP 20   At midweek, Fall Out Boy is predicted to edge out The Greatest Showman soundtrack for #1. With three days left in the chart week, it’s still pretty close, especially now that "This Is Me" from Showman has received a Best Original Song Oscar nomination.    *Fall Out Boy (Island) 110-115k SPS, 104-109k Sales The Greatest Showman (Atlantic) 105-110k, 74-79k Ed Sheeran (Atlantic) 42-46k, 11-13k Camila Cabello (Syco/Epic) 37-40k, 9-11k