Ruby hash-rockets with symbol keys are broken

I'm pretty sure this used to work, but it seems like it no longer does. This:

```ruby
{
:something => 'foo',
:else => 'bar'
}
```

Turns into this:

```ruby
{
: something => 'foo',
: else => 'bar'
}
```

I have to remove `:` from the "Left Separators" config for it to work, but I assume that breaks other cases...

For clarity, I expect this:

```ruby
{
:something => 'foo',
:else => 'bar'
}
```