Fix wrong value used for index in pose JSON
Fix wrong value used for index in pose JSON

- Wrong iteration variable was used to index into the pose keypoints
  during JSON generation -- resulting in every point having the same x/y
  coordinate.

Change-Id: Ia0dda38e3390adac2816933c34c04fe75082ad93
GitOrigin-RevId: 9c643196495a9480f1255229f16fc3b6e3f2e618

google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro,google-coral/coralmicro