Fix indent of comments starting at the beginning of the line

If you try to indent the comment, it won't indent. even if it should in this example:
```php
<?php

if (true) {
// body
}
```

But if we put a space in front of the comment so it looks like this:
```php
<?php

if (true) {
 // body
}
```
The comment get's indented to 4 spaces.

This patch fixes that it gets indented anyways :)

(Nothing in PSR-2 states that it *have* to be like this, but it's nice and I think all the coding styles should adopt this patch)