Describe the bug

To Reproduce

1. Go to subscription management (/i/?c=subscription)
2. Click on any feed's setting
3. Change the feed url (in the above screenshot, from rss.xml to index.xml)
4. Hover on the Check the validity of the feed button
5. See it uses old feed url (rss.xml) as the parameter

Expected behavior

It should use the new feed url as parameter.

FreshRSS version

1.28.0

System information

• Installation type: docker
• Device: macbook air m1
• OS: macOS 15.6.1 (24G90)
• Browser: Dia v1.13.1 (73101) based on Chromium version 143.0.7499.194

Additional context

No response