Remove unused option in Anycubic Kossel config (#12138)

Marlin/src/config/examples/delta/Anycubic/Kossel/Configuration.h

   // and processor overload (too many expensive sqrt calls).
   #define DELTA_SEGMENTS_PER_SECOND 80
 
-  // Convert feedrates to apply to the Effector instead of the Carriages
-  //#define DELTA_FEEDRATE_SCALING
-
   // After homing move down to a height where XY movement is unconstrained
   #define DELTA_HOME_TO_SAFE_ZONE