Need to re-add WebDav when certificate changes

### Please agree to the following

- [X] I have searched [existing issues](https://github.com/cryptomator/cryptomator/issues?q=) for duplicates
- [X] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/cryptomator/blob/develop/.github/CODE_OF_CONDUCT.md)

### Summary

When the self-signed certificate gets invalid or re-newed, the secure WebDav connection needs to be re-added

### What software is involved?

iOS 17.1.2, Cryptomator 2.4.9

### Volume Type

WebDAV (HTTP Address)

### Steps to Reproduce

Add WebDAV address with https, IP and self-signed cert
let the certificate either auto-renew or expire

### Expected Behavior

Option, to go into the WebDAV connection screen and re-trust the certificate.

### Actual Behavior

Files app goes into a faceID loop, and not displaying contents.
When opening Cryptomator and going into the WebDAV connection, it says that the certificate changed and is not trusted.
I need to delete the connection (and therefore all vaults) and readd them one by one

### Reproducibility

Always

### Relevant Log Output

_No response_

### Anything else?

_No response_