Fix issue with homing already homed delta printer #603
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The function homeZAxis for homing a delta printer didn't work correctly when the printer was already at home position. It didn't pass check for endstops at line 1424 as Endstops::accumulator was reset at line 1416 and no update to the accumulator was done.
Adding reseting actual state before move instruction fixed this issue on my machine.
Other option would be to force endstops update even if no change is detected when homing, but I'm just guessing.