Removed no longer neccessary Webpack bugfix.

app/next.config.js

@@ -1,9 +0,0 @@
-/* eslint-disable import/unambiguous */
-
-module.exports = {
-  webpack: config => {
-    // See https://github.com/webpack/webpack/issues/5135
-    config.module.strictThisContextOnImports = true
-    return config
-  }
-}