Fix link color selected

Carlo Lobrano requested to merge c.lobrano/gtk:fix-link-color-selected into master

Adwaita: Always use link colors for link target

link target uses $selected_bg_color and $selected_fg_color for the definition of some selectors (e.g. selected).

While $link_color and $link_visited_color are based on $selected_bg_color, this does not seem coherent.

Replacing $selected_*g_color in link target style with link colors defined in _colors.scss file.

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