WASHINGTON — Timeout, Tom Thibodeau. The Knicks’ first-half lead in the second leg of a back-to-back against the Wizards on Saturday ballooned as large as 26. And then came the Wizards. Stop after stop. Bucket after bucket. The Knicks’ lead evaporated to as little as five. Thibodeau flailed his arms in frustration. This couldn’t be the same team that defeated two championship contenders in the three games that followed the OG Anunoby trade with the Raptors. Thibodeau’s timeout at the 5:23 mark of the third quarter changed the game. Veteran big man Taj Gibson urged his teammates to remain calm….