Prompt Mode: Specific series of command cause crash.

[Antonedw]

When in prompt mode if one sets a plate through setup_plate, then follows this with sonicate_wells() to test the arm will crash.

This happens because the final step in a plate setup forces you to calibrate the z height of the sonication horn, once this step is done the arm returns the sonication horn back home and the arm stays connected or at the very least in contact with the sonication horn. When calling sonicate_wells() right after, it seems as if the horn pushes and crashes into the horn.