Fix to be able to set z-offset to negative value with M851 #38
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…st z offset with M851 code. Without this change, I can't set the negative z offset (-1.39) in the EEPROM using M851 for my printer with 3D Touch. Now I am able to do all steps documented in the geeetech wiki http://www.geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor
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Changed Z_PROBE_OFFSET_RANGE_MAX to positive value to be able to adjust z offset with M851 code. Without this change, I can't set the negative z offset (-1.39) in the EEPROM using M851 for my printer with 3D Touch. Now I am able to do all steps documented in the geeetech wiki http://www.geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor