QuickFix for adding missing annotation attributes should generate SingleMemberAnnotation if applicable

If you have an annotation of the form:

```java
public @interface MyAnnotation {
String value();
}
```

Then you can apply it to java code like this:

```java
@MyAnnotation("my string")
public class MyClass {
}
```

However, if you apply the QuickFix suggested when you have not filled in the required value:

```java
@MyAnnotation
public class MyClass {
}
```

Then it will do this instead:

```java
@MyAnnotation(value = "")
public class MyClass {
}
```

I think it'd be nice if the QuickFix used the compact syntax when it's able to.