This theme (or component) msg doesn't go away

[RGJ (Richard - Communiteq)]

@Bathinda

very (though deprecated) theme from my web_only.yml

• There is the deprecated plugin Topic List Previews (legacy)

• There is the working theme component Topic List Previews Theme Component

• Theme (components) are never in web_only.yml or app.yml

• The update message is about the theme component.