Fix wiggle tests

crates/wiggle/tests/ints.witx

@@ -1,18 +1,13 @@
 (use "errno.witx")
 
-(typename $cookie
-  (int u64
-    (const $start 0)))
+(typename $cookie u64)
+(@witx const $cookie $start 0)
 
-(typename $bool
-  (enum u8
-    $false
-    $true))
+(typename $bool bool)
 
 (module $ints
   (@interface func (export "cookie_cutter")
     (param $init_cookie $cookie)
-    (result $error $errno)
-    (result $is_start $bool)
+    (result $error (expected $bool (error $errno)))
   )
 )