Use the non-deprecated MX_PROCESS_TERMINATED spelling

Change-Id: I80626a9b2c704f22172cbead9b3c17f28e1ccfbf
diff --git a/fuchsia/fuchsia-compat.c b/fuchsia/fuchsia-compat.c
index 7da25e2..d98dc56 100644
--- a/fuchsia/fuchsia-compat.c
+++ b/fuchsia/fuchsia-compat.c
@@ -83,7 +83,7 @@
   Child* child = voidp;
 
   mx_signals_t observed;
-  mx_object_wait_one(child->handle, MX_PROCESS_SIGNALED, MX_TIME_INFINITE, &observed);
+  mx_object_wait_one(child->handle, MX_PROCESS_TERMINATED, MX_TIME_INFINITE, &observed);
 
   mx_info_process_t info;
   size_t actual;