[WIP] Ignore camera confidence when syncing with hand raise

[parkersruth]

I believe commenting out this line should allow hand punch synchronization to be performed without eliminating low-confidence keypoints.

[suhlrich]

This ought to work. We want to avoid spurious low confidence shoulder and hand positions. This and the following line filter out low confidence and smooth, which should be enough, but we should do some testing. Can you test reprocess a few walking and maybe TUG sessions (there will be some low-confidence arms during the turn).