Don't panic in the generated rust ComponentHandle::window()

It can panic if lazily constructing the window adapter.
Make sure it is actially not lasily constructed, we don't need lazy constructor when not embedding anyway.

internal/compiler/generator/rust.rs

@@ -291,6 +291,8 @@ fn generate_public_component(
                 #init_bundle_translations
                 inner.globals.get().unwrap().init();
                 #inner_component_id::user_init(sp::VRc::map(inner.clone(), |x| x));
+                // ensure that the window exist as this point so further call to window() don't panic
+                inner.globals.get().unwrap().window_adapter_ref()?;
                 core::result::Result::Ok(Self(inner))
             }