list.Base: neo-theme-neo-light needs an item background-color

[tobiu]

--list-item-background-color: var(--cmp-list-item-surface-default);

this comes from: --cmp-list-item-surface-default: transparent

i think i already fixed it inside the repo, but the change to #fff needs to get into the figma template to keep it fixed :)

rationale: scrolling with sticky headers

[tobiu]

pushed the change into the output.

@mxmrtns: please add a comment when the change is also inside the figma template and we can close this ticket. thx!