Audacity doesn't remember selected dropdown values in LV2 plugins

### Bug description

I noticed this with Calf and LSP plugins (LV2). May affect also other formats.

### Steps to reproduce

1. Add e.g. LSP Delay Compensator Mono plugin from LSP LV2
2. Set mode to "Time"
3. Close the plugin
4. Open the plugin again

### Expected behavior

The mode is the selected "Time".

### Actual behavior

The mode is the default value "Distance".

Seems that Audacity actually obeys the selected value, but the dropdown value is not updated correctly when the plugin is opened again. Same happens with e.g. "Calf Equalizer 8 Band".

### Audacity Version

Audacity 3.7.5

### Operating system

Linux

### Additional context

Audacity 3.7.5 AppImage, Ubuntu 24.04 LTS.