#2 Corrected channel map for ASSY-77-H3

One of the channels under "contact_positions" was misplaced and caused subsequent channels to misalign (see attached picture). The channel at (0,340.0) is now moved to the correct position in the new file. The png file has not been updated, but should be regenerated with new channel map in the future.

@samuelgarcia can we merge this?

Hi. I close this PR. For cambridgeneurotech probe I maintain a code that generate all json probe. This is based on a excel file given directly by the manufacturer.