Transpile libbitsub to ES5 in webpack build

webpack.common.js

@@ -224,6 +224,7 @@ const config = {
                     path.resolve(__dirname, 'node_modules/flv.js'),
                     path.resolve(__dirname, 'node_modules/highlight-words'),
                     path.resolve(__dirname, 'node_modules/libarchive.js'),
+                    path.resolve(__dirname, 'node_modules/libbitsub'),
                     path.resolve(__dirname, 'node_modules/linkify-it'),
                     path.resolve(__dirname, 'node_modules/markdown-it'),
                     path.resolve(__dirname, 'node_modules/material-react-table'),