QA: minor code tweak

Remove some duplication.

Author: jrfnl

phpunit-bootstrap.php

@@ -79,5 +79,4 @@
 \putenv("PHPCS_IGNORE_TESTS={$standardsToIgnoreString}");
 
 // Clean up.
-unset($ds, $phpcsDir, $composerPHPCSPath);
 unset($ds, $phpcsDir, $composerPHPCSPath, $allStandards, $standardsToIgnore, $standard, $standardsToIgnoreString);