Revert "Fix webpack automatic publicPath error on tests (#546)" (#547)

This reverts commit ce10b30.

Author: jeromewu

packages/ffmpeg/webpack.config.js

@@ -8,8 +8,6 @@ module.exports = {
     extensions: [".js"],
   },
   output: {
-    // disable automatic publicPath
-    publicPath: "",
     path: path.resolve(__dirname, "dist/umd"),
     filename: "ffmpeg.js",
     library: "FFmpegWASM",