Opening a slider node makes the workspace dirty

### Current Behavior

If you open a slider node and hit Done, it makes the workspace dirty.

It looks like the "thumbLabel" property changes between `"false"` (string) and `false` (boolean).

### Expected Behavior

_No response_

### Steps To Reproduce

Open a slider node and click Done without making changes.

### Environment

- Dashboard version: 1.191
- Node-RED version: 4.0.5
- Node.js version: 22.11.0
- npm version: 10.9.0
- Platform/OS: macOS Sequoia 15.1
- Browser: Safari

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

I can not provide an initial effort estimate