fix webpack config entry

webpack.js

 const webpackConfig = require('@nextcloud/webpack-vue-config')
+const path = require('path')
 
 webpackConfig.resolve['fallback']= {fs: false }
 
+webpackConfig.entry['main'] = path.join(__dirname, 'src', 'main.js'),
+webpackConfig.entry['config'] = path.join(__dirname, 'src', 'config.js')
+
 module.exports = webpackConfig
\ No newline at end of file