message: Simplify hover logic
diff: @@ -281,9 +281,8 @@ export default async function embed(
  let { hover } = opt;
  - // Enable hover for Vega by default.
  if (hover === undefined) {
  - hover = mode !== 'vega-lite';
  + hover = mode === 'vega';
  }
  if (hover) {
  