[PHP-WEBMASTER] [web-php] PR #636: Enhancement: Enable no_trailing_whitespace fixer

[localheinz]

Pull Request: https://github.com/php/web-php/pull/636
Author: localheinz

This pull request

- [x] enables the `no_trailing_whitespace` fixer

Follows #559.

💁‍♂️ For reference, see 
https://github.com/FriendsOfPHP/PHP-CS-Fixer/blob/v3.4.0/doc/rules/whitespace/no_trailing_whitespace.rst.

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