Anycubic Kossel Linear+: corrected DELTA_DIAGONAL_ROD (#11964)

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

     // Print surface diameter/2 minus unreachable space (avoid collisions with vertical towers).
     #define DELTA_PRINTABLE_RADIUS 116.0 // mm
     // Center-to-center distance of the holes in the diagonal push rods.
-    #define DELTA_DIAGONAL_ROD 271.5 // mm
+    #define DELTA_DIAGONAL_ROD 267 // mm
       // Horizontal offset from middle of printer to smooth rod center.
     #define DELTA_SMOOTH_ROD_OFFSET 186 // mm
     // Horizontal offset of the universal joints on the end effector.