added babystep min and max defines

Firmware/variants/1_75mm_MK2-RAMBo13a-E3Dv6full.h

@@ -321,4 +321,7 @@ THERMISTORS SETTINGS
 #define PRINT_STARTED 0xFE
 #define PRINT_FINISHED 0xFF
 
+#define Z_BABYSTEP_MIN -3999
+#define Z_BABYSTEP_MAX 0
+
 #endif //__CONFIGURATION_PRUSA_H