Fix Install CSS (#792)

public/install/forms.php

@@ -300,4 +300,4 @@ if (isset($_POST['createUser'])) {
         wh_log($db->error, 'error');
         header('LOCATION: index.php?step=6&message=Something went wrong when communicating with the Database');
     }
-}
+}

public/install/index.php

@@ -22,7 +22,7 @@ function cardStart($title, $subtitle = null)
     <title>Controlpanel.gg installer Script</title>
 
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <link href="styles.css" rel="stylesheet">
+    <link href="/install/styles.css" rel="stylesheet">
     <style>
         body {
             color-scheme: dark;