Y-calibration goes wrong the first time (easy work around available)

[GuidoCram]

Expected Behavior

After calibrating the y-axis, the farmbot goes all the way back.

Actual Behavior

At the end of the first y-calibtration, the farmbot goes back half way. Recalibrating again gives the expected behaviour.

Steps to Reproduce

Unplug the formbot untill it requires new network information
Configure farmbot WiFi and account
Go to the web interface >> device
Calibrate X
Calibrate Y

(note that calibrating Y again will give expected behaviour)
(note that I have seen this twice by accident, I did no additional testing)

Results of git log -1

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