Can't reset button group state

### Current Behavior

With dashboard v.1.13 I was able to reset selected state from button group:
Example flow: https://discourse.nodered.org/t/button-group-selection-reset/91106/1
With v.1.17 I'm unable to do it so.

### Expected Behavior

By sending empty msg.payload reset to unselected state

### Steps To Reproduce

_No response_

### Environment

- Dashboard version: 1.17
- Node-RED version: 4.0.2
- Node.js version: 20
- npm version:
- Platform/OS:
- Browser:

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate