webpack: Drop unnecessary output settings

The default of `path` and `sourceMapFilename` are already what we want,
no need to set them explicitly.

The `output.filename` is already `[name].js`, and it's totally not
important to name the file differently in production mode (it will then
just be `index.js.gz`, compared to index.js in development mode).

webpack.config.js

@@ -12,7 +12,6 @@ var externals = {
 /* These can be overridden, typically from the Makefile.am */
 const srcdir = (process.env.SRCDIR || __dirname) + path.sep + "src";
 const builddir = (process.env.SRCDIR || __dirname);
-const distdir = builddir + path.sep + "dist";
 const section = process.env.ONLYDIR || null;
 const nodedir = path.resolve((process.env.SRCDIR || __dirname), "node_modules");
 
@@ -31,12 +30,6 @@ var info = {
     ],
 };
 
-var output = {
-    path: distdir,
-    filename: "[name].js",
-    sourceMapFilename: "[file].map",
-};
-
 /*
  * Note that we're avoiding the use of path.join as webpack and nodejs
  * want relative paths that start with ./ explicitly.
@@ -84,9 +77,6 @@ var plugins = [
 
 /* Only minimize when in production mode */
 if (production) {
-    /* Rename output files when minimizing */
-    output.filename = "[name].min.js";
-
     plugins.unshift(new CompressionPlugin({
         test: /\.(js|html)$/,
         minRatio: 0.9,
@@ -126,7 +116,6 @@ module.exports = {
     },
     entry: info.entries,
     externals: externals,
-    output: output,
     devtool: "source-map",
     module: {
         rules: [