PropertyLabelSpacing JS fixer issue when there is no space after colon  

When fixing the following code PHPCS adds extra spaces between the string and the closing brace. Fixer works fine when there is a single space after phpcs: 

``` js
// Original code:
fn.phpcs(
    {phpcs:'rocks my world'}
);

// After running fixer:
fn.phpcs(
    {phpcs:'rocks my world'    }
);
```
