custom JS removed in favor of proper CSRF implementation

assets/views/auth/set_password.html

@@ -29,6 +29,7 @@
       {% endif %}
 
       <form method="post" action="/set-password" hx-boost="false" class="mt-4 flex flex-col gap-4">
+  {{ ui::csrf_field() }}
         <input type="hidden" name="token" value="{{ token }}">
         <div class="flex flex-col gap-1">
           <label for="password" class="text-sm font-medium text-on-surface-strong dark:text-on-surface-dark-strong">{{ t(key="set-password-new", lang=lang | default(value='sk')) }}</label>