[fuchsia] Update run_vm_tests_fuchsia for fuchsia launchpad API change

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 a7839a931c426dbe1e9ee09398ed4a62cd609524..fddba5e0b4920d61b2ad1de9b2eddb5a15e565a4 100644
--- a/runtime/bin/run_vm_tests_fuchsia.cc
+++ b/runtime/bin/run_vm_tests_fuchsia.cc
@@ -156,7 +156,7 @@ static int run_test(const char* test_name) {
   argv[1] = old_gen_arg;
   argv[2] = test_name;
 
-  mx_handle_t p = launchpad_launch(argv[0], kArgc, argv);
+  mx_handle_t p = launchpad_launch_mxio(argv[0], kArgc, argv);
   if (p < 0) {
     fprintf(stderr, "process failed to start\n");
     return -1;