Remove skin_no_small_gaps_heuristic
Remove skin_no_small_gaps_heuristic

Apparently this setting doesn't exist in the legacy Cura.

Contributes to issue CURA-37.

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