Update qr_solve.h

Changed level to compensation

Marlin/qr_solve.h

 #include "Configuration.h"
 
-#ifdef AUTO_BED_LEVELING_GRID
+#ifdef AUTO_BED_COMPENSATION_GRID
 
 void daxpy ( int n, double da, double dx[], int incx, double dy[], int incy );
 double ddot ( int n, double dx[], int incx, double dy[], int incy );