I'm removing an unneded block of configuration from the `settings.gradle` template. It was introduced by me in #123511. At that time, I did not know that it's unnecessary, and did not test removing it – sorry about that.

I learned that it's unnecessary recently, when [I asked a question on StackOverflow](https://stackoverflow.com/questions/77073596/whats-the-difference-between-plugins-and-pluginmanagement-plugins-in). More context there.