[EN] Can't set brightness of lights in a zone without specifying the light name

[Sleuth56]

Steps to reproduce:

1. Setup voice pipline
2. Add a smart light to a zone
3. Add a voice device to HA and set it to the same zone as the light
4. Say to the voice device Set the lights to 50%

I did notice in my testing that Set the brightness to 50% works.

[mitrokun]

There was a similar question in this issue
This feature is easy to implement, but is it worth it?

[ViViDboarder]

Should be covered by #2783