Makeblock mBot - LaserBot X;Y axis overtravel fix

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Why the laser head reaches to the X-axis or Y-axis without
stop
Issue: The laser head reaches to the X-axis or Y-axis without stopping.
Reason: The limit switches on X-axis or Y-axis connect to the wrong pins on MegaPi.
Troubleshooting:
1. In the "self-test", check if the icon X and Y turns into green when press the corresponding
limit switch. As the video “Software Tutorial of LaserBot” shows starting from 00:59.