fix auth page action

embed/auth.html

@@ -1,6 +1,6 @@
 <h2>Authorization for {{.ClientId}}</h2>
 
-<form action="" method="post">
+<form action="verify/" method="post">
     <label for="password">Password</label>
     <input type="password" name="password" placeholder="Password">
     <input type="hidden" name="client_id" value="{{.ClientId}}">