Fix autocomplete issues in change password form (#7812)

## Screenshots

<details>
<summary>Before</summary>

<img width="773" height="652" alt="image" src="https://github.com/user-attachments/assets/89a0e58c-8c4a-41ff-b5d6-3e916079d563" />

</details>

<details>
<summary>After</summary>

<img width="1006" height="646" alt="image" src="https://github.com/user-attachments/assets/f4575103-7365-4870-a170-2742bf10eb27" />

</details>

This is an example on Firefox, where the `Master authentication token` field was incorrectly being autofilled.
Red borders are indicating that the fields are required.

## List of changes

* `required="required"` is now being added to the password fields if the section is open
* The `challenge` field is being added if section is open instead of when at least one of the password fields isn't empty due to autocomplete
* Added `autocomplete="new-password"` on fields that shouldn't be autocompleted
   * Unfortunately Chrome requires a workaround with CSS
   * Not tested on Safari yet
* User will be redirected to profile page after successfully changing their password instead of index page

## How to test

Autocomplete related changes should be tested on a HTTPS page with saved credentials for FreshRSS

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