Fix connecting undo action to undo button
Fix connecting undo action to undo button

Also hiding the message afterwards. Apparently that's not done automatically.

Contributes to issue CURA-2822.

Curahelper/Cura,ynotstartups/Wanhao,fieldOfView/Cura,Curahelper/Cura,fieldOfView/Cura,ynotstartups/Wanhao