[run-tests.php] Merge multiple unset() calls to a single call

Author: Ayesh

run-tests.php

@@ -1567,8 +1567,7 @@ function run_all_tests_parallel(array $test_files, array $env, $redir_tested): v
                                 ]);
                             } else {
                                 proc_terminate($workerProcs[$i]);
-                                unset($workerProcs[$i]);
-                                unset($workerSocks[$i]);
+                                unset($workerProcs[$i], $workerSocks[$i]);
                                 goto escape;
                             }
                             break;