Default CSS overriding Citizen skin buttons in "Insert link" dialog for WikiEditor

[felipeforte]

In the folder mediawiki-skins-Citizen/skinStyles/jquery.ui/smoothness/jquery.ui.theme.less, a CSS is suggested for the .ui-state-default class: background-color: var( --background-color-framed );

However, the original CSS for the .ui-state-default class overrides the Citizen CSS. This is the result:

Instead of background-color, using background immediately fixes the issue.