User-multilined method chains and binaries won't stay multilined

[reese]

• Rubyfmt git sha: ed99cc4

Input file

foo
  .bar
  .baz

foo &&
  bar ||
  baz

Rubyfmt's output

foo.bar.baz

foo && bar || baz

This breaks because

For other "breakable" constructs like method params, array literals, etc., we use the multiline form if the user originally multilined it, but we don't do this for method chains and binaries since they have "special" multilining implementations (e.g. they don't use breakable_of internally). For consistency's sake, we should multiline user-multilined constructs for these.