fix: correct indentation of non-root instanceof expressions

[jtkiesel]

What changed with this PR:

instanceof expressions not at the root of the binary expression are now properly indented, like those at the root.

Example

Input

class Example {

  void example() {
    var a =
      a &&
      Foo.get(longlinelonglinelonglinelonglinelongline) instanceof
      NumberNumberNumberNumber n &&
      n.foo();

    var a =
      Foo.get(longlinelonglinelonglinelonglinelongline) instanceof
      NumberNumberNumberNumber n &&
      n.foo();
  }
}

Output

class Example {

  void example() {
    var a =
      a &&
      Foo.get(longlinelonglinelonglinelonglinelongline) instanceof
        NumberNumberNumberNumber n &&
      n.foo();

    var a =
      Foo.get(longlinelonglinelonglinelonglinelongline) instanceof
        NumberNumberNumberNumber n &&
      n.foo();
  }
}

Relative issues or prs:

Closes #762