[fidl] Update Directory Open ordinal now that it is autogenerated

Test: CQ

Change-Id: I488f7f56eaabdce44ba07430614b7edefc16d1aa
diff --git a/public/lib/app/dart/src/rio.dart b/public/lib/app/dart/src/rio.dart
index 30f90db..48f13d7 100644
--- a/public/lib/app/dart/src/rio.dart
+++ b/public/lib/app/dart/src/rio.dart
@@ -44,7 +44,7 @@
   offset += 4;
 
   // ordinal -> ZXFIDL_OPEN
-  byteData.setUint32(offset, 0x83000001, Endian.little);
+  byteData.setUint32(offset, 0x77E4CCEB, Endian.little);
   offset += 4;
 
   // flags -> ZX_FS_RIGHT_READABLE | ZX_FS_RIGHT_WRITABLE