Stephen Colbert welcomed Massachusetts Sen. Elizabeth Warren to The Late Show tonight to talk about Donald Trump — among other things. But right at the top, the two talked about how their lives have changed since Warren was last on the show — and since 45 took office. Colbert pointed out that the last time Warren was on The Late Show, Trump was not the president to which she fondly said, “Oh, I remember those days.” She then asked, “How long has he been president…