pipeify functions whose first argument is a pipe

## Versions

* Elixir: use `elixir --version`
* Styler: use `mix deps | grep locked | grep styler`

## Example Input

```elixir
# should get piped but doesn't, because the root node is not a pipe
a(b |> c |> d)

# correctly gets piped since the root node is a pipe
a(b(c)) |> d()
```

## Stacktrace / Current Behaviour
