Scrutinizer Auto-Fixes

@Spomky requested this pull request.

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/Spomky-Labs/oauth2-server-implicit-grant-type/inspections/73849201-17f3-4582-a2b9-2090c02b0209

Enabled analysis tools:
 - PHP Analyzer
 - PHP Mess Detector
 - PHP Code Sniffer
 - Security Advisory Checker
 - PHP Copy/Paste Detector
 - PHP PDepend
 - External Code Coverage
 - PHP Change Tracking Analyzer