Reduce usage of LP_CLONE_FDIO_CWD

To pass a CWD to a child through launchpad, simply set
the PWD environment variable, and the child will open
their CWD relative to their root when they initialize.

Change-Id: I3638aca635a09333807d536284adf008badcc073
diff --git a/fuchsia/fuchsia-compat.c b/fuchsia/fuchsia-compat.c
index 666c219..510ab9b 100644
--- a/fuchsia/fuchsia-compat.c
+++ b/fuchsia/fuchsia-compat.c
@@ -296,7 +296,7 @@
   launchpad_create(0, command, &lp);
   launchpad_load_from_file(lp, argv[0]);
   launchpad_set_args(lp, argc, argv);
-  launchpad_clone(lp, LP_CLONE_FDIO_NAMESPACE | LP_CLONE_FDIO_CWD);
+  launchpad_clone(lp, LP_CLONE_FDIO_NAMESPACE);
   // TODO: set up environment
   if (in == out) {
     launchpad_clone_fd(lp, in, STDIN_FILENO);