plugins: remove usages of --experimental-type-build

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/user-settings-backend/src/alpha.ts

@@ -25,7 +25,7 @@ import { createRouter } from './service/router';
  *
  * @alpha
  */
-export const userSettingsPlugin = createBackendPlugin({
+export default createBackendPlugin({
   pluginId: 'userSettings',
   register(env) {
     env.registerInit({

plugins/user-settings-backend/src/index.ts

@@ -16,4 +16,3 @@
 
 export * from './service';
 export * from './database';
-export { userSettingsPlugin as default } from './plugin';