refac: rm substandard code

src/routes/auth/+page.svelte

@@ -14,7 +14,7 @@
 	import { WEBUI_API_BASE_URL, WEBUI_BASE_URL } from '$lib/constants';
 	import { WEBUI_NAME, config, user, socket } from '$lib/stores';
 
-	import { generateInitialsImage, canvasPixelTest, querystringValue } from '$lib/utils';
+	import { generateInitialsImage, canvasPixelTest } from '$lib/utils';
 
 	import Spinner from '$lib/components/common/Spinner.svelte';
 	import OnBoarding from '$lib/components/OnBoarding.svelte';
@@ -46,7 +46,7 @@
 			await user.set(sessionUser);
 			await config.set(await getBackendConfig());
 
-			const redirectPath = querystringValue('redirect') || '/';
+			const redirectPath = $page.url.searchParams.get('redirect') || '/';
 			goto(redirectPath);
 		}
 	};