No Z stall by default

Marlin/Configuration_adv.h

     #define X2_STALL_SENSITIVITY X_STALL_SENSITIVITY
     #define Y_STALL_SENSITIVITY  8
     #define Y2_STALL_SENSITIVITY Y_STALL_SENSITIVITY
-    #define Z_STALL_SENSITIVITY  8
-    #define Z2_STALL_SENSITIVITY Z_STALL_SENSITIVITY
-    #define Z3_STALL_SENSITIVITY Z_STALL_SENSITIVITY
-    #define Z4_STALL_SENSITIVITY Z_STALL_SENSITIVITY
+    //#define Z_STALL_SENSITIVITY  8
+    //#define Z2_STALL_SENSITIVITY Z_STALL_SENSITIVITY
+    //#define Z3_STALL_SENSITIVITY Z_STALL_SENSITIVITY
+    //#define Z4_STALL_SENSITIVITY Z_STALL_SENSITIVITY
     //#define SPI_ENDSTOPS              // TMC2130 only
     //#define IMPROVE_HOMING_RELIABILITY
   #endif