Fix colour values for toggle

[ekidneyrh]

Is your enhancement related to a problem? Please describe

I think the toggle would benefit from some changes to the colours. Atm, it looks like this:

Dark:

https://github.com/containers/podman-desktop/assets/87311656/1b83204f-23b7-426a-b54a-f753eea4b8c7

Light:

https://github.com/containers/podman-desktop/assets/87311656/552139f6-1780-4edf-8f72-a41f5c568bc2

Describe the solution you'd like

As part of https://github.com/containers/podman-desktop/issues/6929, this is my proposal:

Toggle.pdf

Can also be found here: https://github.com/containers/podman-desktop/wiki/Design-System-Theming#toggle

Describe alternatives you've considered

No response

Additional context

No response