Fix definedResourceTables ReferenceError with instantiation mode (#456)

The `js_instrinsics` should be defined under the `instantiate` function.
Otherwise we get the following error:

```
dist/component/ruby.component.js:73
  if (definedResourceTables[toTid]) return rep;
  ^

ReferenceError: definedResourceTables is not defined
```

crates/js-component-bindgen/src/transpile_bindgen.rs

@@ -260,17 +260,17 @@ impl<'a> JsBindgen<'a> {
  uwrite!(
  output,
  "\
- {}
  export function instantiate(getCoreModule, imports, instantiateCore = {}) {{
  {}
  {}
+ {}
  ",
- &js_intrinsics as &str,
  match instantiation {
  InstantiationMode::Async => "WebAssembly.instantiate",
  InstantiationMode::Sync =>
  "(module, importObject) => new WebAssembly.Instance(module, importObject)",
  },
+ &js_intrinsics as &str,
  &intrinsic_definitions as &str,
  &compilation_promises as &str,
  );