Config UI: Keep MQTT CA/certificate/key on edit

[poggenpower]

Describe the bug

If you have created a mqtt integration and going to edit it again. CA/Certificate/Key field are shown empty, even if they were configured before. This would be OK if saving those won't delete them from settings.

Steps to reproduce

1. Create a MQTT integration and configure CA/Cert and Key
2. Restart to activate this settings
3. Edit the MQTT integration e.g. by changing the topic.
4. Restart to activate the changes
5. Server won't come up because of missing certificates.
   ...

Configuration details

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Log details

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What type of operating system are you running?

Linux

Nightly build

• I have verified that the issue is reproducible with the latest nightly build

Version

evcc 0.131.4

[andig]

This also applies to password.