Fix to be able to set z-offset to negative value with M851#38

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rsans wants to merge 1 commit intoGeeetech3D:masterfrom rsans:master

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Commits on Mar 4, 2019

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 print…
rsans
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