add skin on registration complete page

src/routes/register/Register.svelte

@@ -44,7 +44,7 @@
 				body: new FormData(document.forms[0])
 			});
 			if (response.ok) {
-				dispatch('submit', {});
+				dispatch('submit', { username: usernameInput.value });
 				resolve();
 			} else if (response.status < 500) {
 				reject(Error((await response.json()).message));