Passwords - Search bar keeps previous query but doesn't filter the credential List

:page_facing_up: Description

Steps to Reproduce:

1. Go to Settings → Autofills & Passwords → Passwords.
2. Enter a search query in the search bar.
3. Tap on one of the filtered credential entries.
4. Perform an action (e.g., view, edit, or delete).
5. Navigate back to the credentials list.

Expected Behavior: When returning to the credential list, the search bar should still be populated and the list should remain filtered accordingly.

Actual Behavior: The search bar still shows the previous search term but the list of credentials is no longer filtered and shows all entries.

Device & Build Information:

• Device: iPhone 16 Pro (iOS 18.3.2)
• Build Version: Firefox 138 (5411)
• First Seen Version: ?

:information_source: Reference Person

@FilippoZazzeroni

┆Issue is synchronized with this Jira Bug