It was supposed to be a feel-good moment. The Chairman and CEO of the world’s most powerful financial institution dropped by CNBC’s Squawk Box to crow a bit about his recovery from cancer. But it didn’t quite go the way Lloyd Blankfein — or Hillary Clinton — might’ve wanted. First, the recently-minted billionaire boss of Goldman Sachs compared his 600 hours of chemotherapy to dropping “napalm” on …