add danmuku maxWidth

packages/artplayer-plugin-danmuku/src/style.less

@@ -5,8 +5,8 @@
     width: 100%;
     font-size: 12px;
     line-height: 1;
-    max-width: 400px;
     border-radius: 3px;
+    max-width: 100%;
     color: #ffffff;
     background-color: rgb(255 255 255 / 30%);
     font-family: Roboto, Arial, Helvetica, sans-serif;