Fix inherit function for infill line distance
Fix inherit function for infill line distance

For some reason using parent value here creates odd override bugs

Curahelper/Cura,ynotstartups/Wanhao,totalretribution/Cura,ynotstartups/Wanhao,markwal/Cura,senttech/Cura,ad1217/Cura,markwal/Cura,ad1217/Cura,Curahelper/Cura,fieldOfView/Cura,totalretribution/Cura,fieldOfView/Cura,hmflash/Cura,bq/Ultimaker-Cura,senttech/Cura,bq/Ultimaker-Cura,hmflash/Cura