Remove unused mixin
Remove unused mixin

Fadable control is only available in the host frame, not the control
frame.

Factlink/factlink-core,Factlink/factlink-core,daukantas/factlink-core,Factlink/factlink-core,daukantas/factlink-core,daukantas/factlink-core,daukantas/factlink-core,Factlink/factlink-core