clang-format: [Java] Make annotation formatting more consistent.

Before:
  DoSomething(new A() {
    @Override public String toString() {
    }
  });

After:
  DoSomething(new A() {
    @Override
    public String toString() {
    }
  });

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220282 91177308-0d34-0410-b5e6-96231b3b80d8