Adds needlessly parentheses

**Prettier-Java 2.10.3**

[Playground link](https://www.jhipster.tech/prettier-java/playground#N4IgDgTglgdgLgdSgEzgCxALgCwAYA0IcAhgEZKoaYBMhArgM4CmAKmQ1gGbEA2zhxCBAD2AdwAKgpjA6YQvUcQCeHQnAjEoPWAHMAwsIC2h4lnk8eIQkwAeYJtEPSSPAPL2NcYRHHCGUOChhGDNpZCsQCCYARzooKPENHRMuXn4QAGNhZCYzBlEAjLQAAgAKGwBKYuAAHRhi4oziZmKAQWLiYtE0aQ6AOhi6NNLiPuJx4iqAWgA+YvU6JgBuOoBfEFWgA)

```sh
--print-width 40
```

**Input:**
```java
switch (x) {
case A a when a.equals(a.aaaa) -> true;
}
```

**Output:**

```java
switch (x) {
case A a when (
a.equals(a.aaaa)
) -> true;
}
```

**Expected behavior:**
```java
switch (x) {
case A a when
a.equals(a.aaaa)
-> true;
}
```

Or something.

Reproduce the example in the linked Prettier-Java Playground with --print-width 40 and compare the current and expected formatting. Trace how the switch case guard is formatted, then verify that the same input no longer adds parentheses and preserves the shown line breaks.

Written by the indexing model from the issue text.