Fix extruder tabs for >2 extruders or long extruder names
Fix extruder tabs for >2 extruders or long extruder names

CURA-340

Curahelper/Cura,ynotstartups/Wanhao,fieldOfView/Cura,fieldOfView/Cura,hmflash/Cura,totalretribution/Cura,Curahelper/Cura,ynotstartups/Wanhao,senttech/Cura,totalretribution/Cura,hmflash/Cura,senttech/Cura