[FR] Add Delete Buttons to all certificate parts in MQTT

[KoMa1978]

Currently it is only possible to delete the private key but not the CA certificate or Client certificate.
They can be deleted by API calls but doing this in WebUI would be nice as well.

[rednblkx]

what do you see? the buttons are already there and should work

[KoMa1978]

The Delete button is only for the privateKey (using Chrome) which is working fine.
There is no Delete button for Client certificate nor for CA certificate.

[KoMa1978]

I think data/src/lib/types/api.ts does not define "exists" for CA and ClientCert while it does for PrivateKey.

[rednblkx]

looks like it might be a layout issue, i see the text is overflowing which probably pushes the button outside the container and outside the view. i need to redo that subsection anyway, it was a quick prototype i put together to test it and never touched it again, i'll move the button at the bottom or at least in an occlusive place if i end up changing the layout of it.

[rednblkx]

Fixed in dev build