NcListItem has inconsistent styles for active elements

[Antreesy]

• :hover, :focus, e.t.c style overriding background-color for active
• probably a regression from Remove border from sidebar tabs #4449, cc @marcoambrosini

Default	Expected	Result
Top-to-bottom: inactive, active, inactive hovered	inactive, active hovered, inactive	inactive, active hovered, inactive
--color-primary-element	--color-primary-element-hover	--color-background-hover