Fuchsia: Fix deprecated jobs call

runtime/bin/run_vm_tests_fuchsia.cc

Index: runtime/bin/run_vm_tests_fuchsia.cc
diff --git a/runtime/bin/run_vm_tests_fuchsia.cc b/runtime/bin/run_vm_tests_fuchsia.cc
index e7d4015dc3eb3bf4fcb703d27b755b5feba030f3..da8e19cfe7ee254d9ffdd500e154dc34e80d1edd 100644
--- a/runtime/bin/run_vm_tests_fuchsia.cc
+++ b/runtime/bin/run_vm_tests_fuchsia.cc
@@ -134,8 +134,7 @@ static mx_status_t lp_setup(launchpad_t** lp_out,
   launchpad_t* lp;
   mx_status_t status;
   mx_handle_t job = MX_HANDLE_INVALID;
-  status =
-      mx_handle_duplicate(launchpad_get_mxio_job(), MX_RIGHT_SAME_RIGHTS, &job);
+  status = mx_handle_duplicate(mx_job_default(), MX_RIGHT_SAME_RIGHTS, &job);
   RETURN_IF_ERROR(status);
   status = launchpad_create(job, argv[0], &lp);
   RETURN_IF_ERROR(status);