[PHP-WEBMASTER] [web-php] PR #561: Fix: Remove unused private property

[localheinz]

Pull Request: https://github.com/php/web-php/pull/561
Author: localheinz

This pull request

- [x] removes an unused `private` property

💁‍♂️ Running

```shell
git grep -i ratingFactor
```

on current `master` yields

```
include/shared-manual.inc:34:    private $ratingFactor;
```

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