Scrutinizer Auto-Fixes

@miklos-martin requested this pull request.

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/Onend/paypal-sdk-php/inspections/c71306cf-05c1-435c-8280-76c02fbe54ad

Enabled analysis tools:
 - PHP Analyzer
 - PHP Mess Detector
 - PHP Code Sniffer
 - PHP Code Coverage
 - PHP Lines Of Code
 - PHP Similarity Analyzer
 - PHP Change Tracking Analyzer