webpack - move __dirname-config up into shared config

extensions/shared.webpack.config.js

@@ -19,6 +19,9 @@ module.exports = function withDefaults(/**@type WebpackConfig*/extConfig) {
 	let defaultConfig = {
 		mode: 'none', // this leaves the source code as close as possible to the original (when packaging we set this to 'production')
 		target: 'node', // extensions run in a node context
+		node: {
+			__dirname: false // leave the __dirname-behaviour intact
+		},
 		resolve: {
 			mainFields: ['main'], // prefer the main-entry of package.json files
 			extensions: ['.ts', '.js'] // support ts-files and js-files