The demons that made 2018 an agonizing year for Elon Musk are back. Tesla Inc. announced its general counsel is leaving Wednesday, two months after hiring him in the wake of Musk’s run-in with U.S. securities regulators. Hours before that news, the chief executive officer was sending tweets reminiscent of those that put him and the company in legal jeopardy last fall. Dane Butswinkas, the trial lawyer who represented Musk in his legal battle with the U.S.