Convert y2014 to use explicit ids

This makes it harder to accidentally break compatability

Change-Id: Id0e5cdb56a1e442b7d39fd7c9f9424a192462462
diff --git a/build_tests/test.fbs b/build_tests/test.fbs
index 71db3e7..ca153ac 100644
--- a/build_tests/test.fbs
+++ b/build_tests/test.fbs
@@ -1,11 +1,11 @@
 namespace aos.examples;
 
 table Foo {
-  value:int;
+  value:int32 (id: 0);
 }
 
 table Bar {
-  value:int;
+  value:int32 (id: 0);
 }
 
 root_type Foo;