Revert "adjusted configuration to cover for compatibility on firefox and safari (module-federation#3107)"

This reverts commit 7bd3029.

Author: wibed

react-18-ssr/shell/config/webpack.shared.js

@@ -21,7 +21,6 @@ const webpackConfig = {
       },
     ],
   },
-  optimization: { splitChunks: { chunks: 'initial' }}
 };
 
 module.exports = webpackConfig;