update path handling

src/pages/admin/login.astro

@@ -27,7 +27,6 @@ import Popup from '@components/popup/Popup.svelte';
 
 <script>
   import { actions } from 'astro:actions';
-  import { BASE_PATH } from 'astro:env/client';
   import { popupState } from '@components/popup/Popup';
 
   const loginForm = document.getElementById('login') as HTMLFormElement;
@@ -45,6 +44,6 @@ import Popup from '@components/popup/Popup.svelte';
       popupState.set({ type: 'error', title: 'Fehler', message: error.message });
       return;
     }
-    window.location.href = `${BASE_PATH}/admin`;
+    window.location.href = 'admin';
   });
 </script>