Revert "Fix function signature"

This reverts commit d70ebf98b0c696f3c66a20b1243cb347e3e3abc8.

Nope. A struct return is not returned that way.
diff --git a/src/hb-wasm-api-list.hh b/src/hb-wasm-api-list.hh
index a283428..ee41235 100644
--- a/src/hb-wasm-api-list.hh
+++ b/src/hb-wasm-api-list.hh
@@ -52,7 +52,7 @@
 {
 
   /* face */
-  NATIVE_SYMBOL ("(ii)i",	face_reference_table),
+  NATIVE_SYMBOL ("(iii)",	face_reference_table),
 
   /* font */
   NATIVE_SYMBOL ("(i)i",	font_get_face),