chore: Optimize danmuku plugin performance and update configuration handling

packages/artplayer-plugin-danmuku/src/danmuku.js

@@ -572,12 +572,13 @@ export default class Danmuku {
             danmu.$lastStartTime = Date.now();
             switch (danmu.mode) {
                 // 滚动的弹幕
-                case 0:
+                case 0: {
                     const distance = clientWidth + danmu.$ref.clientWidth;
                     danmu.$ref.style.left = `${clientWidth}px`;
                     danmu.$ref.style.transform = `translateX(${-distance}px)`;
                     danmu.$ref.style.transition = `transform ${danmu.$restTime}s linear 0s`;
                     break;
+                }
                 default:
                     break;
             }