Move reverb silder to advanced settings

**What is the current behaviour and why should it be changed?**

Currently, the reverb slider takes up a lot of space in the main mixer board. It is assumed that this could be mistaken as general volume slider. In order to simplify the UI, the reverb slider should go to advanced settings instead.

In future - if we support plugins, the reverb feature could be removed and replaced by custom reverb plugins.

**Describe possible approaches**

Move the slider to advanced settings.

**Has this feature been discussed and generally agreed?**

See: https://github.com/orgs/jamulussoftware/discussions/3341#discussioncomment-10576183
https://github.com/jamulussoftware/jamulus/discussions/2361#discussioncomment-10677859

No se nombra ningún archivo fuente ni ninguna prueba. Empieza por localizar el control deslizante de reverberación de la mesa de mezclas y la UI de configuración avanzada, y luego verifica que el control deslizante ya no se muestre en el mezclador principal y siga estando disponible en la configuración avanzada.

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