Toggle > 'Disabled' state uses opacity instead of variables

Toggles use opacity instead of colour variables to create the subdued appearance of the toggle-disabled state.

Component should be updated to use colour variables ($grey-200).

Pajamas UI Kit updated as part of fix(Toggle): Allows Figma component 'Label' tex... (gitlab-org/gitlab-services/design.gitlab.com#1246 - closed)

Screenshot