BUGFIX: Allow phpunit tests to run even if phpcs.xml.dist is provided

* By adding Coding Standard to calls, phpcs will not lookup the standard
  to use in our phpcs.xml.dist, which is used to check the project
  itself.
* Instead it will use the provided standard.

tests/SniffsTest.php

@@ -115,6 +115,7 @@ class SniffsTest extends TestCase
     protected function executeSniff(\SplFileInfo $folder, array $arguments = [])
     {
         $internalArguments = array_merge_recursive([
+            'standard' => 'Typo3Update',
             'runtime-set' => [
                 'mappingFile' => __DIR__ . DIRECTORY_SEPARATOR
                     . 'Fixtures' . DIRECTORY_SEPARATOR