MIAMI — Five takeaways from the Miami Heat’s 98-90 loss to the Toronto Raptors (1-2) on Saturday night at FTX Arena to close its season-opening four-game homestand at a disappointing 1-3. The Heat now hits the road to begin a three-game West Coast trip on Wednesday against the Portland Trail Blazers: The Heat’s offense simply wasn’t good enough.Even with the Raptors shooting just 39.5 percent from the field, they found a way to win on Monday. That’s because the Heat closed with just 90 points on 34.9 percent shooting from the field and 8-of-33 (24.2 percent) shooting from three-point range. Th…