Inconsistency between indent level in AOSP and non-aosp

I am not entirely sure wether this is the intended behavior, so here is an issue. The the continuation of the long string doesn't indent with 8 spaces from the previous line which I would expect in AOSP.

Test.java
```java
public class Test {
String s = "asdfasdfasdfasdf asdfasdfasdfasdfasdfasdffasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasd";
}
```

```bash
❯ java -jar ~/Downloads/google-java-format-1.24.0-all-deps.jar Test.java
public class Test {
String s =
"asdfasdfasdfasdf"
+ " asdfasdfasdfasdfasdfasdffasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasd";
}
```

```bash
❯ java -jar ~/Downloads/google-java-format-1.24.0-all-deps.jar --aosp Test.java
public class Test {
String s =
"asdfasdfasdfasdf"
+ " asdfasdfasdfasdfasdfasdffasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasd";
}
```

I would expect the following output using AOSP style

```java
public class Test {
String s =
"asdfasdfasdfasdf"
+ " asdfasdfasdfasdfasdfasdffasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasdfasd";
}
```

I raised this issue in the spotless repo because I figured that spotless not indenting the same way as GJF would be a spotless bug.

If this is the intended behavior, please let me know, so that I can reraise the issue at spotless.

Reproduce the report with the Test.java example and run google-java-format both with and without --aosp. Compare the continuation-string indentation with the expected AOSP output, then inspect the formatter behavior responsible for that difference. Done means the AOSP result is clarified or corrected and covered by an appropriate regression test.

Escrita pelo modelo de indexação a partir do texto da issue.