Update CompiledFile.php (#1693)
Update CompiledFile.php (#1693)

const CACHE_DIR already defined with trailing slash

```php
define('CACHE_DIR', ROOT_DIR . 'cache/');
```
tomzx/blog.tomrochette.com,tomzx/blog.tomrochette.com,stell/grav,notklaatu/grav,tomzx/blog.tomrochette.com,Vivalldi/grav,getgrav/grav,tomzx/blog.tomrochette.com,dimayakovlev/grav,Vivalldi/grav,dimayakovlev/grav,getgrav/grav,notklaatu/grav