By Luc Cohen NEW YORK (Reuters) – A courtroom portrait led Donald Trump to deliver a blunt self-assessment on Thursday: “I gotta lose some weight.” The former president’s banter with a courtroom artist came as he made an appearance at his ongoing civil fraud trial in New York. Outside the courtroom, the former president, 77, told news reporters that the trial was a “fraud” and a “witch hunt,” repeating well-worn complaints that he is the victim of political targeting. Inside the chamber, he appeared to be in a better mood as he viewed the work of sketch artists Jane Rosenberg and Isabelle Brou…