Remove webpackMode option

Author: jmsche

frontend/create_ux_bundle.rst

@@ -47,7 +47,6 @@ to the ``peerDependencies``:
             "controllers": {
                 "slug": {
                     "main": "dist/controller.js",
-                    "webpackMode": "eager",
                     "fetch": "eager",
                     "enabled": true,
                     "autoimport": {